The Wild Story of Ohtani’s Interpreter and the Banana Bet

Updated August 4, 2026 9 min read

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The Wild Story of Ohtani’s Interpreter and the Banana Bet: How Ippei Mizuhara Stole Millions and Gambled It All Away

TL;DR: Ippei Mizuhara, the former interpreter for MLB superstar Shohei Ohtani, orchestrated one of the most shocking sports betting scandals in recent memory by stealing nearly $16 million from the Dodgers pitcher to fund a massive illegal gambling addiction. Bookmaker Matthew Bowyer, who took Mizuhara’s bets, recently revealed the depth of the interpreter’s addiction and the wild, often incomprehensible wagers — including what became known as the “banana bet” — that signaled something was deeply wrong from the very beginning.

The story of Ippei Mizuhara’s downfall reads like a Hollywood thriller. What began as a trusted friendship between a Japanese baseball icon and his English-speaking right hand spiraled into a federal criminal case involving illegal bookmakers, offshore gambling rings, and stolen millions. Here is everything you need to know about how the scandal unfolded and the latest developments as of 2026.

Quick Answer

Ippei Mizuhara, Shohei Ohtani’s personal interpreter and close confidant, was exposed in March 2024 for stealing approximately $16 million from Ohtani’s bank accounts to place illegal sports bets with bookmaker Matthew Bowyer and others. Mizuhara pleaded guilty to federal bank fraud and tax fraud charges in June 2024. Bowyer has since spoken publicly about Mizuhara’s escalating gambling addiction, describing the interpreter’s increasingly erratic and wild wagers — including bizarre “banana bets” — as clear warning signs that something had spiraled far out of control.

Who Is Ippei Mizuhara and How Did He Get Close to Ohtani?

Ippei Mizuhara served as Shohei Ohtani’s personal interpreter starting in 2018, when Ohtani first came to the United States to play for the Los Angeles Angels. The pair developed an exceptionally close bond, with Mizuhara serving not just as a translator but as a cultural guide, confidant, and daily companion. When Ohtani signed his record-breaking 10-year, $700 million contract with the Los Angeles Dodgers in December 2023, Mizuhara came along — and that is when the financial deception reached its peak.

According to federal prosecutors, Mizuhara gained access to Ohtani’s bank accounts under the guise of managing the pitcher’s finances. He exploited the language barrier and Ohtani’s trust to wire millions of dollars to illegal gambling operations over a period spanning several years. The sheer scale of the theft — nearly $16 million — shocked the sports world and raised serious questions about athlete financial security.

What Was the Banana Bet and Why Does It Matter?

The term “banana bet” became a symbol of just how out of control Mizuhara’s gambling had become. Bookmaker Matthew Bowyer, who was among the illegal operators taking Mizuhara’s wagers, described certain bets placed by the interpreter as completely nonsensical — wild, reckless wagers on obscure sports and bizarre propositions that made no strategic sense whatsoever.

According to Bowyer’s public statements, the “banana bet” referred to a category of wagers so unusual and poorly conceived that they defied any logical gambling strategy. These were not the calculated bets of a knowledgeable sports bettor. Instead, they were the frantic, compulsive actions of someone deep in the grip of a gambling addiction, willing to throw money at anything that might produce a quick return. Bowyer said the nature of these bets made Mizuhara’s addiction unmistakably clear to anyone paying attention.

Why Is This Significant to the Case?

The banana bet and similar wild wagers serve as evidence of Mizuhara’s compulsive gambling behavior. They undermine any narrative that the interpreter was a sophisticated gambler making calculated decisions. Instead, they paint a picture of a man who could not stop gambling, regardless of the odds, the stakes, or the source of the money. Federal prosecutors used this pattern of behavior to demonstrate that Mizuhara’s actions constituted deliberate fraud rather than any kind of legitimate financial management.

How Bookmaker Matthew Bowyer Described Mizuhara’s Addiction

Matthew Bowyer, the Southern California-based illegal bookmaker at the center of the scandal, has spoken publicly about his interactions with Mizuhara. In statements reported by ESPN and other outlets, Bowyer said the interpreter’s gambling addiction was visible from their earliest encounters. The signs were unmistakable: Mizuhara bet constantly, chased losses aggressively, and increasingly placed larger wagers to try to recoup previous defeats.

Bowyer described a progression that is typical of severe gambling addiction. Early bets were relatively modest, but they quickly escalated in both frequency and size. The interpreter went from making occasional wagers on NFL and college football games to placing bets on virtually any sporting event available — including obscure international leagues and the kind of bizarre proposition bets that came to be known as banana bets.

What Did Bowyer Say About Enabling Mizuhara?

In a candid interview, Bowyer acknowledged that he bore responsibility for continuing to accept Mizuhara’s bets even as the warning signs mounted. He stated that the addiction was obvious early on and that, as a bookmaker, he had a financial incentive to keep the action flowing. Bowyer ultimately faced federal charges himself for running an illegal gambling operation, and he has cooperated with authorities as part of the broader investigation into the network of bookmakers connected to the scandal.

Timeline of the Scandal

Date	Event
2018	Ippei Mizuhara becomes Shohei Ohtani’s personal interpreter with the Los Angeles Angels
2018–2024	Federal prosecutors allege Mizuhara stole approximately $16 million from Ohtani’s accounts to fund illegal gambling
December 2023	Ohtani signs a 10-year, $700 million contract with the Los Angeles Dodgers; Mizuhara accompanies him
March 2024	The scandal breaks publicly during the Dodgers’ Opening Series in South Korea; Mizuhara is fired
April 2024	Mizuhara is arrested by federal agents on bank fraud and tax charges
June 2024	Mizuhara pleads guilty to one count of bank fraud and one count of subscribing to a false tax return
2025	Mizuhara is sentenced in federal court; bookmaker Matthew Bowyer and associates also face charges
2026	Bowyer and other bookmakers continue to provide details about Mizuhara’s betting patterns and addiction, including the banana bet revelations

How Did the Scandal Come to Light?

The scandal unraveled in dramatic fashion during the Dodgers’ Opening Series against the San Diego Padres in Seoul, South Korea, in March 2024. Reports surfaced that a large sum of money had been wired from Ohtani’s bank account to an illegal bookmaker. Initially, Mizuhara gave a confusing interview in which he appeared to admit to gambling on sports, saying he had used Ohtani’s money but claimed the pitcher knew about it and had agreed to help cover his debts.

That account quickly fell apart. Ohtani’s legal team and representatives categorically denied that Ohtani had any knowledge of or involvement in the gambling. Within hours, the Dodgers fired Mizuhara, and federal investigators moved in. The story evolved rapidly from a “misunderstanding” into one of the biggest financial fraud cases in professional sports history.

What Did the Federal Investigation Reveal?

Federal prosecutors painted a detailed picture of a multi-year scheme in which Mizuhara systematically drained Ohtani’s bank accounts. Using his privileged access and the trust Ohtani placed in him, Mizuhara directed wire transfers to various illegal bookmakers, including Bowyer’s operation. The funds were used to cover gambling losses and place new bets in a desperate cycle of escalation. Prosecutors also revealed that Mizuhara filed false tax returns, further compounding his criminal liability.

Why Was Ohtani Not Charged?

Despite initial suspicion and intense media scrutiny, federal authorities concluded that Shohei Ohtani was a victim of Mizuhara’s fraud, not a participant in it. Investigators found no evidence that Ohtani authorized the wire transfers, knew about the gambling, or benefited in any way from the scheme. The pitcher cooperated fully with the investigation, and authorities ultimately determined that the theft was carried out entirely by Mizuhara, who exploited his position of trust to exploit a language and cultural barrier.

This conclusion was bolstered by the testimony and statements from multiple bookmakers, including Bowyer, who confirmed that Mizuhara was the sole individual placing bets and that Ohtani never had direct contact with any gambling operation. The “banana bets” and other reckless wagers further supported the narrative that a single individual with a compulsive addiction was operating without oversight.

What Are the Legal Consequences for Those Involved?

Ippei Mizuhara

Mizuhara pleaded guilty in June 2024 to one count of bank fraud, carrying a potential sentence of up to 30 years in federal prison, and one count of subscribing to a false tax return. By pleading guilty, Mizuhara accepted criminal responsibility for the entire scheme. His sentencing reflects the severity of both the financial fraud and the betrayal of trust involved.

Matthew Bowyer and Other Bookmakers

Matthew Bowyer was arrested and charged with operating an illegal gambling business. Other bookmakers and associates connected to the offshore gambling network also faced charges. Bowyer’s cooperation with federal authorities and his public statements about Mizuhara’s addiction have provided crucial insight into how the illegal gambling operation functioned and how Mizuhara’s bets escalated over time.

Key Takeaways

Ippei Mizuhara stole nearly $16 million from Shohei Ohtani over several years to fund illegal sports gambling with bookmaker Matthew Bowyer and others.
The “banana bet” — a term describing Mizuhara’s wild, nonsensical wagers — was a clear sign of compulsive gambling addiction that bookmakers recognized early on.
Federal investigators concluded Ohtani was entirely a victim and bore no responsibility for the fraud.
Mizuhara pleaded guilty to federal bank fraud and tax charges in June 2024 and faces a significant prison sentence.
The scandal has sparked broader conversations about athlete financial security, the dangers of illegal gambling, and the responsibilities of those who operate in the shadows of professional sports.

What Does This Scandal Mean for Athlete Financial Security?

The Ohtani-Mizuhara scandal has become a cautionary tale about the vulnerabilities athletes face when they place unconditional trust in personal employees without adequate financial safeguards. Professional athletes, particularly those who cross language and cultural barriers, are uniquely susceptible to exploitation by trusted associates. Financial advisors, sports management consultants, and team organizations have used this case to advocate for stronger protections, including mandatory independent oversight of athletes’ finances and stricter vetting of personal staff.

MLB and the Dodgers have also reviewed their protocols for foreign-born players. The league has expanded support services for international players, including financial literacy programs and access to independent translators for sensitive matters such as banking and legal proceedings. These changes aim to prevent a repeat of a scenario in which a single individual could exploit a player’s trust to the tune of $16 million.

The Bottom Line

The wild story of Ohtani’s interpreter and the banana bet is far more than a sensational headline. It is a case study in how unchecked trust, language barriers, and the shadows of illegal gambling can converge to produce a financial catastrophe. Ippei Mizuhara’s compulsive gambling addiction — laid bare by the bizarre banana bets and other reckless wagers that bookmaker Matthew Bowyer described — turned a once-close partnership into a federal crime. Shohei Ohtani emerged as a victim who lost millions but ultimately regained control of his career and reputation. Meanwhile, the legal consequences for Mizuhara, Bowyer, and their associates serve as a stark reminder that illegal gambling carries real and devastating consequences. The story of Ohtani’s interpreter and the banana bet will remain one of the most remarkable scandals in modern sports history.