Most Home Runs by a Japanese MLB Rookie? Okamoto and Murakami Rewrite the Record in 2026

One of the biggest thrills in baseball is watching a Japanese star go deep in his very first MLB season. In 2026, two rookies aren’t just chasing that thrill — they’re rewriting the record book, with Toronto’s Kazuma Okamoto and Chicago’s Munetaka Murakami both blowing past the mark Shohei Ohtani set in 2018.

Key Takeaways

• Kazuma Okamoto (Toronto Blue Jays) has set a new record for the most home runs by a Japanese MLB rookie, hitting 23 in 2026 to pass Shohei Ohtani’s 22 from 2018.
• Munetaka Murakami (Chicago White Sox) sits at 22 — tied with Ohtani for second — despite missing about six weeks with a hamstring injury.
• Before the injury, Murakami was on pace for roughly 58 home runs, a total that would rank among MLB’s very best.
• The rookie “wall” has shifted from adjusting to moving fastballs to solving the sweeper and a livelier ball — with data analytics now decisive.
• Ichiro Suzuki (2001) and Kosuke Fukudome (2008) prove the list doesn’t tell the whole story: both left a mark far bigger than their home run totals.

The Record: Most Home Runs by a Japanese MLB Rookie

Here is the all-time ranking for home runs hit by a Japanese player in his rookie MLB season, as of late July 2026.

Rank	Player	HR	Year	Team
1	Kazuma Okamoto	23	2026	Blue Jays
2	Shohei Ohtani	22	2018	Angels
2	Munetaka Murakami	22	2026	White Sox
4	Kenji Johjima	18	2006	Mariners
5	Hideki Matsui	16	2003	Yankees
6	Tadahito Iguchi	15	2005	White Sox
6	Masataka Yoshida	15	2023	Red Sox
8	Seiya Suzuki	14	2022	Cubs
9	Tsuyoshi Shinjo	10	2001	Mets
9	Kosuke Fukudome	10	2008	Cubs
9	Norichika Aoki	10	2012	Brewers
12	Ichiro Suzuki	8	2001	Mariners
12	Yoshitomo Tsutsugo	8	2020	Rays

Okamoto’s 23rd homer broke the previous record of 22, set by Ohtani in 2018. Because both Okamoto and Murakami are still playing, those totals could climb further — and with Murakami tied with Ohtani for second, his next home run would give him sole possession of the No. 2 spot.

The 2026 Class Leading the Charge

The home run surge from Japan’s 2026 rookies has been relentless, and both of the players at the top of the list have already cleared Ohtani’s 22.

Munetaka Murakami (Chicago White Sox)

Munetaka Murakami, a 26-year-old corner infielder who became the youngest Triple Crown winner in NPB history with the Tokyo Yakult Swallows (Central League, based in Tokyo), signed a two-year, $34 million deal with the White Sox through the posting system before the 2026 season.

He announced himself immediately, homering in each of his first three games — a first for a Japanese player — and was named the American League’s Rookie of the Month in May. Before he got hurt, he was on a staggering 58-homer pace.

Then a right hamstring injury cost him about six weeks, stalling his total at 20. He returned July 10 and, in a July 26 game against the Astros, launched his 21st and 22nd home runs with a six-RBI night — his first long balls in nearly two months — pulling even with Ohtani’s rookie record of 22. With plenty of season left, the question is how much of that lost time he can make up.

Kazuma Okamoto (Toronto Blue Jays)

Kazuma Okamoto, a 30-year-old third baseman who spent years as the cleanup hitter for the Yomiuri Giants (Central League, Tokyo — Japan’s most storied franchise), joined the Blue Jays via the posting system for his rookie 2026 campaign.

He started slowly, sitting at a .216 average with 12 homers at the end of May. Then he erupted for seven home runs in June to claim AL Rookie of the Month — the second straight month a Japanese player won the award, after Murakami. He kept climbing in July, hitting his first career grand slam for No. 21 off ace Webb on July 8 and tying Ohtani at 22 on July 10. After a brief slump, he connected for No. 23 against the Red Sox on July 24 to pass Ohtani and set the new record for a Japanese rookie. His average isn’t high, but his home runs and RBIs lead the team by a wide margin.

How the “Rookie Wall” Has Changed

For earlier generations, the biggest obstacle in a first MLB season was adjusting to fastballs that darted and dove late. In 2026, the challenge has shifted: the key to success now is how quickly a rookie can respond to data-driven baseball.

The Livelier Ball and the Rise of the Sweeper

The rookie wall has changed character over the years. Where late-moving fastballs once posed the toughest test, today’s game features an offensive spike — enough that some suspect a livelier ball — alongside the emergence of a new weapon, the sweeper.

The sweeper, which breaks sharply across the plate, is especially brutal on a hitter seeing it for the first time. Yet more and more hitters, Murakami among them, are using cutting-edge analytics to anticipate the pitch’s path and driving the livelier ball with sheer power. The blueprint has flipped — from taking time to adjust, to arriving on Day 1 and smashing through the wall with force and technology.

The Data Revolution

Japanese players used to need repeated at-bats to learn an opposing pitcher’s tendencies. As of 2026, Statcast breaks down mechanics to the millimeter, and AI-based pitch prediction is standard.

Before a hitter ever steps into the box, his swing quirks and weak spots are shared across every team, so rookies get attacked at their weaknesses from the opening day. The key to beating this evolved, data-heavy game is a player’s own ability to filter information — to avoid drowning in the numbers, stay true to his swing, and use the latest tools to speed up his adjustment. The 2026 breakout by Japanese players is the product of fusing Japanese craftsmanship with American analytics.

Why NPB Success Now Translates

The link between NPB production and MLB adjustment has become one of the clearest explanations for the recent wave of Japanese hitters. It was once said that “NPB power won’t play in the majors.”

But the success of Ohtani, along with Seiya Suzuki and Murakami, shows that dominant NPB numbers can translate directly into immediate MLB impact. Making the jump in one’s mid-20s — a hitter’s prime — helps a player keep the bat speed needed not to get overpowered by big-league velocity. Add the efficient launch angles that American analytics provide to the contact skills honed in Japan, and an NPB home run king can evolve into a genuine slugger in the majors.

Unforgettable Rookies Who Missed the List

The numbers on the ranking don’t capture everything. A few players left an impact far larger than their home run totals — moments burned into fans’ memories.

Kosuke Fukudome

When Kosuke Fukudome joined the Chicago Cubs in 2008, the excitement he generated went well beyond the stat line. The signature moment came on Opening Day at home in Wrigley Field: down three runs in the bottom of the ninth with two outs, he crushed a game-tying three-run homer and sent the packed crowd into a frenzy.

That dramatic debut won fans over instantly. In right field, supporters even hoisted a sign reading “偶然だぞ” — Japanese for “it’s a coincidence,” a playful pun on his surname — and he became hugely popular in Chicago. His strong first half earned him an All-Star selection, making him just the third Japanese position player to be named an All-Star, after Ichiro and Hideki Matsui. He faded in the second half, but the shock of that opener is still the stuff of legend.

Ichiro Suzuki

Ichiro Suzuki hit only eight home runs as a rookie with the 2001 Seattle Mariners, but his first season was a nonstop assault on baseball history. Defying the scouting consensus that “Japanese position players won’t cut it,” he racked up hits from day one — a league-best 242 of them — with a .350 average and 56 stolen bases, becoming the first player ever to win Rookie of the Year and MVP in the same season.

His throws from right field, dubbed the “laser beam,” proved to American fans that a player could take over a game with defense and baserunning. In an era ruled by the home run, his style — lighting up ballparks with singles and speed — changed the very concept of the game, and he’ll be remembered as a rookie whose impact went far beyond any record.