Kazuma Okamoto Stats: 248 NPB Homers and a Blue Jays Rookie Year

Kazuma Okamoto spent eight years as the cleanup hitter for Japan’s most famous baseball team, then signed with Toronto for four years and $60 million. Five months into his first MLB season the power has translated exactly as advertised — 28 home runs — and almost nothing else has.

Key Takeaways

• Okamoto hit 248 home runs with 717 RBIs over 11 NPB seasons with the Yomiuri Giants, winning three home run titles, two RBI titles and three Golden Glove Awards.
• He is the first homegrown Giants position player to move to MLB since Hideki Matsui joined the Yankees in 2003, a 23-year gap.
• Through Sept. 3, 2026, he is batting .227 with 28 home runs, 78 RBIs and a .742 OPS in 135 games for the Blue Jays.
• He was the American League Rookie of the Month for June and is a leading Rookie of the Year candidate, with fellow NPB import Munetaka Murakami as his main rival.
• The problems are contact and defense: 165 strikeouts, a .302 on-base percentage and 15 errors at third base.

Kazuma Okamoto’s NPB Stats: 11 Seasons With the Yomiuri Giants

Okamoto was born in June 1996 in Gojo, a small city in Nara Prefecture, and hit 73 home runs at Chiben Gakuen High School before the Yomiuri Giants (Central League, based in Tokyo and by far Japan’s most followed club) took him with a first-round pick in the 2014 draft.

He homered in his first professional season but did not become a regular until year four. In 2018 he took over the cleanup spot in June and hit .309 with 33 home runs and 100 RBIs — at 22, the youngest player in NPB history to put up a .300 average, 30 homers and 100 RBIs in the same season.

From there he was the Giants’ No. 4 hitter without interruption, clearing 30 home runs in six consecutive seasons from 2018 through 2023, tied for the ninth-longest such streak in NPB history. In 2020 and 2021 he won the home run and RBI titles in back-to-back years, something no right-handed hitter in Giants history had done.

Year	G	AVG	HR	RBI	BB	SO	OPS
2015	17	.214	1	4	2	4	.611
2016	3	.100	0	0	0	2	.300
2017	15	.194	0	2	4	10	.512
2018	143	.309	33	100	72	120	.935
2019	143	.265	31	94	62	132	.828
2020	118	.275	31	97	55	85	.907
2021	143	.265	39	113	57	108	.871
2022	140	.252	30	82	58	94	.805
2023	140	.278	41	93	72	111	.958
2024	143	.280	27	83	66	97	.863
2025	69	.327	15	49	33	33	1.014
Career	1,074	.277	248	717	481	796	.882

Read those home run totals with the schedule in mind: NPB plays 143 games, not 162, so a 41-homer season in Japan is a bigger share of a shorter year than the raw number suggests.

His final NPB season was cut in half. Okamoto tore a ligament in his left elbow in May 2025 and missed roughly three months, then returned in August and hit .327 with a 1.014 OPS the rest of the way — 15 home runs and 49 RBIs in 69 games. Whatever the injury cost him, it was not the bat.

Three Home Run Titles

Okamoto led the Central League in home runs in 2020, 2021 and 2023.

The first came on 31 homers, edging Yusuke Oyama of the Hanshin Tigers. In 2021 he hit a then-career-high 39 and finished level with Munetaka Murakami of the Tokyo Yakult Swallows, so the two shared the title. In 2023 he hit 41, took the crown outright, homered three times in a single game in August and became the ninth player in NPB history with six straight 30-homer seasons. Reaching 40 in a season at 27 made him the youngest right-handed hitter in Giants history to do it.

For context on how rare the back-to-back titles were: the last Giant to lead the league in home runs in consecutive seasons was Sadaharu Oh, in 1977, 44 years earlier.

Two RBI Titles and a Reputation for Clutch Hitting

Okamoto also led the league in RBIs in 2020 and 2021, with 97 and then a career-best 113. In 2021 he started all 143 games in the cleanup spot.

The RBI totals rest on a reputation he built early: in Japan he was regarded as one of the game’s best hitters with runners on base, a quality Japanese baseball treats as a distinct skill. The evidence people point to is the postseason. In the 2019 Climax Series — NPB’s playoff round, which determines who reaches the Japan Series — he went 8 for 15 with three home runs and seven RBIs and was named MVP of the Final Stage.

He did it in Interleague Play, too. NPB’s Central and Pacific League clubs meet in a concentrated interleague block each June, and in 2023 Okamoto hit .383 with eight home runs and 19 RBIs across it to win Interleague MVP for the first time.

Golden Gloves and Best Nine

Okamoto was not a bat-only player in Japan. He won the Golden Glove Award at third base in 2021 and 2022 and at first base in 2024.

Analyst and former NPB infielder Shinya Miyamoto has praised the way Okamoto judges his distance to hard-hit balls and how rarely he gives away routine plays. His throwing was the steadiest part of the package — errant throws were close to nonexistent.

He also made the Best Nine — NPB’s annual all-league team, voted by the media — twice: at third base in 2020, the year he won both the home run and RBI titles, and at first base in 2024 alongside his Golden Glove. He missed out in 2019 and 2023 because playing multiple positions split his vote; in 2023 he drew 131 votes at third base and lost by nine to Toshiro Miyazaki of the Yokohama DeNA BayStars. Okamoto has said the experience taught him the value of settling in at one position.

What Kind of Hitter Okamoto Is

The scouting summary that got him a $60 million deal was straightforward: a right-handed third baseman with genuine power is one of the scarcer commodities in baseball, and Okamoto pairs the power with contact skills and a real approach. His .882 career NPB OPS is elite-tier for a slugger in that league.

All-Fields Power

Okamoto’s swing produces home runs to every part of the yard. He hits a lot of them to right field — the opposite field for a right-handed hitter — and does it with the authority of a pull hitter rather than the flare of an inside-out swing.

The mechanism is in his right elbow. He keeps it folded through impact, which routes the bat close to his body and gets the barrel out on the shortest path, so he can cover the inner half and the outer half with the same swing. Against high fastballs he softens his left elbow slightly at contact, a move that lets the barrel get up in the zone in time. Japanese observers have compared the up-and-down, in-and-out coverage to Kazuhiro Kiyohara’s.

He also spends part of every offseason hitting with a tennis racket, a drill built around squaring the ball up with a flat face rather than swinging harder.

The one MLB benchmark worth citing: he reached 100 career home runs at Tokyo Dome in 2023, the eighth player to do it, and got there in 395 games — faster than anyone before him.

The power showed up in Toronto immediately. Through Sept. 3 he has 28 home runs and a .440 slugging percentage as a rookie, a total few Japanese infielders have approached in a first MLB season. Matsui, the last Giants position player to make this jump, hit 16 as a Yankees rookie in 2003.

Plate Discipline and Durability

In Japan, Okamoto walked. His 481 career walks are among the most by any hitter over that stretch, and in 2023 he drew 72 of them and posted a .374 on-base percentage.

That discipline is what pushed his OPS so high. A .882 career mark clears the .800 line that generally separates good hitters from stars in NPB, and his 2023 figure of .958 led the Central League.

He was also hard to finish off. With two strikes he fouled pitches away and waited for something to hit, which ran up pitch counts and got opposing starters out of games early. And he stayed on the field: from 2018 through 2024 he played at least 100 games and hit at least 20 home runs in seven straight seasons, without the extended slumps that usually punctuate a power hitter’s career.

Okamoto in International Play: Two World Baseball Classics

Okamoto has been in Japan’s international program since high school. He batted cleanup for Japan at the 2014 U-18 Asian Baseball Championship, where the team finished second, and homered off an MLB All-Star squad during the 2018 Japan-MLB exhibition series.

2023: A Title Run and a Home Run in the Final

The 2023 World Baseball Classic was Okamoto’s breakout on the international stage. Playing mostly first base under manager Hideki Kuriyama, he started all seven games and hit .333 with two home runs, seven RBIs and a .566 on-base percentage.

He drove in five runs in the quarterfinal against Italy, including a three-run homer. In the final against the United States he added a solo shot in the fourth inning as Japan won its third WBC title and first in three tournaments.

The tournament also produced the moment American fans remember him for: in the semifinal against Mexico, Randy Arozarena climbed the left field wall to take a home run away from him. The next night he hit one nobody could catch.

Performing against MLB pitching in that setting changed how he was viewed on both sides of the Pacific, and MLB scouting interest jumped from there.

2026: A Quiet Tournament and an Early Exit

At his introductory press conference with the Blue Jays on Jan. 6, 2026, Okamoto said he wanted to play in the sixth WBC, and he made the Samurai Japan (Japan national baseball team) roster, wearing No. 25 as he had in Tokyo.

Manager Hirokazu Ibata started him at third base and batted him fifth in every game, behind a lineup that included Shohei Ohtani, Seiya Suzuki, Masataka Yoshida and Murakami. The results did not follow: 4 for 19 across five games, .211/.318/.316 in 22 plate appearances.

Japan’s title defense ended in the quarterfinals, where Venezuela — the eventual champion — came back to win 8-5. It was the first time Japan had failed to reach the semifinals of a major international tournament since professionals began participating at the 2000 Sydney Olympics.

Kazuma Okamoto’s 2026 MLB Stats With the Blue Jays

Toronto signed Okamoto on Jan. 4, 2026, for four years and $60 million. The Blue Jays were coming off an American League pennant in 2025, but 2026 has not gone their way — they are 69-71 through Sept. 3, tied for fourth in the AL East.

Okamoto won the third base job out of camp and has held it. First base, where he spent his last NPB season, belongs to Vladimir Guerrero Jr., so the move back across the diamond was settled before he arrived.

Month	G	AVG	HR	RBI	BB	SO	OPS
March	4	.333	2	2	3	6	1.178
April	25	.207	3	13	9	32	.603
May	28	.208	7	18	10	37	.761
June	26	.280	7	20	10	35	.907
July	23	.212	5	15	6	23	.695
August	27	.220	4	10	10	27	.698
September	2	.143	0	0	0	5	.286
Season	135	.227	28	78	48	165	.742

Statistics through Sept. 3, 2026.

The Firsts, and the 500 Level

Okamoto made his MLB debut in the March 27 opener against the Athletics, batting seventh and playing third, walking up to the same Southern All Stars song, “Kibō no Wadachi,” that announced him at Tokyo Dome. Luis Severino struck him out swinging in his first at-bat. He walked in the fifth for his first time on base and scored on an Andrés Giménez triple, then singled to left off Scott Barlow in the seventh for his first hit. Guerrero collected the ball.

Two days later he turned on a pitch from Luis Morales and drove it to right-center for his first MLB home run and RBI. The next day, against the Rockies, he reached 250 home runs between NPB and MLB combined.

His signature swing came June 12 against the Yankees. He hit a first-inning pitch from Ryan Weathers into the fifth deck at Rogers Centre — the 500 Level, the top ring of the building. He was the 10th Blue Jay to reach it and the first since Josh Donaldson on May 30, 2017, nearly nine years earlier.

June was his best month, and on July 3 he was named AL Rookie of the Month for it. Murakami, with the White Sox, had won the award the previous month, making it the first time two Japanese players took Rookie of the Month honors in the same season. On July 27 against the Nationals, Okamoto stole his first MLB base.

What Isn’t Working: Batting Average, Strikeouts and Defense

The .227 average is 50 points below his NPB career mark, and the strikeouts explain most of the gap: 165 of them, roughly 30% of his plate appearances. The patience that defined him in Japan has not survived the move intact either — 48 walks and a .302 on-base percentage. He is still adjusting to MLB velocity and to breaking balls with more break than he saw in the Central League.

The clutch hitting that won him two RBI titles has gone missing as well. He is batting .219 with runners in scoring position, and .219 against right-handed pitching compared with .250 against lefties.

Defensively, at a position he has played for years, he has made 15 errors. The most recent came Sept. 2 against the Guardians, when a shift put him at shortstop and he dropped a popup behind the mound. For a three-time Golden Glove winner, part of the adjustment is the surface itself: NPB is played largely on artificial turf, MLB largely on grass.

The AL Rookie of the Year Race

The batting average is a problem. The power is an argument. Twenty-eight home runs and 78 RBIs from a rookie third baseman on a .500-ish team is a real Rookie of the Year case, and Okamoto is squarely in the AL conversation.

His chief rival is Murakami, who was posted in the same offseason and signed with the White Sox. No Japanese player has won Rookie of the Year since Ohtani took the AL award with the Angels in 2018, which has made a two-Japanese-rookie race the storyline of the season back home.

What Year 2 Could Look Like

Year one of a four-year deal graded out better than the batting average suggests. He claimed an everyday job at a premium defensive position and hit for power against the best pitching in the world, which is the part that does not always translate. Plenty of NPB sluggers have arrived and found the power gone; Okamoto’s is intact.

What has to come back is the approach. The strike zone knowledge that produced 72 walks in a season and an OPS near 1.000 is a skill, not an accident, and hitters who had it in one league usually recover it in the next once they have seen the pitch mix a full time through. If the walk rate climbs back and the strikeouts settle, the batting average and the on-base percentage follow — and the 28 homers turn into a considerably better player than the one his 2026 slash line describes.