Before Yoshinobu Yamamoto became the Dodgers’ latest ace, he was a son, a brother, and a family man from Hyogo, Japan — a foundation that shaped every fastball and every mound moment. His journey isn’t just measured in strikeouts or ERA; it’s written in quiet lessons, family pride, and the humility instilled by those who watched him grow. From parents’ unwavering support to a tight-knit network of mentors and siblings, Yamamoto carries home with him into every game, turning Dodger blue into a bridge across the Pacific. Five fast facts about the family behind one of baseball’s brightest stars reveal the roots of greatness and the heart that fuels every pitch..ll

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Yoshinobu Yamamoto is the Los Angeles Dodgers’ ace pitcher. The 26-year-old right-hander will take the mound in Game 6 of the 2025 World Series against the Toronto Blue Jays in a must-win situation for Los Angeles. The Dodgers are fighting to keep their season alive, and all eyes are on Yamamoto to deliver another clutch performance.

Dodgers manager Dave Roberts, according to The Athletic, said ahead of the game, “He’s pitched with the weight of a country on his shoulders before. That tells you everything about his character.”

Since joining the Dodgers on a record-breaking contract, Yamamoto has proven his value on the mound and become one of MLB’s most talked-about players. Here’s what you need to know.

1. Yoshinobu Yamamoto Was Born in Okayama, Japan

Yamamoto was born on August 17, 1998, in Bizen, Okayama, Japan. His grandmother named him Yoshinobu (山本由伸), taking “Yoshi” from his mother’s name and “Nobu” from his father’s, according to Piece of Japan. He grew up in a supportive family that encouraged his early love for baseball.

He started playing the sport in first grade and initially played third base and catcher before becoming a pitcher. As a kid, Yamamoto said he cried easily and hated to lose. “I remember crying every time we lost,” he said in one interview, reflecting on his competitive spirit even at a young age.

2. Yamamoto’s Family Supported His Move to the U.S.

Yamamoto made the jump from Japan’s Orix Buffaloes to the Los Angeles Dodgers in December 2023, signing a 12-year, $325 million deal — the largest for a pitcher in MLB history. Before deciding, multiple teams, including the Mets, Yankees, and Red Sox, met with him and his family in Japan.

His parents supported his decision to move to the United States, knowing how much he wanted to test himself in Major League Baseball.

Yamamoto, who spoke to NBC News a day before hopping on the plane to Japan for the 2025 season opener, said he’s excited for the homecoming.

“Family, friends, they’ve seen me play back in Japan a bunch of times with the full stadium and everything, but this is, of course, different,” Yamamoto said through a translator.

“This is almost like the first time for them to watch me play as a Dodger … and I’m looking forward to it.”

3. Yoshinobu Yamamoto’s Ethnicity and Heritage Are Japanese

Yamamoto is Japanese by ethnicity and heritage. He grew up in Okayama Prefecture and played through Japan’s youth baseball system before joining Nippon Professional Baseball (NPB). He spent his entire professional career with the Orix Buffaloes before signing with the Dodgers.

He has also represented Japan internationally, winning gold medals at the 2020 Tokyo Olympics and the 2023 World Baseball Classic.

4. Yamamoto’s Rumored Girlfriend Is Japanese Model Niki Niwa

In late 2024, rumors surfaced that Yamamoto was dating Japanese model and actress Niki Niwa after the two were spotted shopping together in Beverly Hills. In a TikTok video posted by creator Jack Banana, Yamamoto confirmed his identity while Niwa introduced herself by name.

Niwa is best known for appearing on Netflix’s “Terrace House: Aloha State” and the drama series “Peanut Butter Sandwich.”

She has built a large following on Instagram, where she shares fashion and travel content. Neither Niwa nor Yamamoto has confirmed the relationship.

5. Yoshinobu Yamamoto’s Dog Helped Foil a Burglary at His Home

In August 2025, Yamamoto narrowly avoided a home burglary while the Dodgers were on the road in Cincinnati. Three people jumped over the back fence of Yamamoto’s Hollywood Hills home and broke a rear glass door, but they quickly fled before entering.

Reports said that the break-in attempt was likely stopped by Yamamoto’s dog, whose loud barking alerted a staff member to turn on the lights, scaring the suspects away. “The dog’s loud barking and a staff member who turned on lights likely helped thwart an early morning burglary attempt at the Dodger phenom’s Hollywood Hills home,” NBC4 Investigates reported.

At the same time, Yamamoto was pitching one of his best games of the season, giving up just one run on four hits and striking out nine batters over seven innings against the Cincinnati Reds.