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Ruiko Mamiya is a Japanese professional poker player and former dealer who has become a significant force on the international circuit, widely recognized for her record-breaking success in the Asian Poker Tour (APT) and her proficiency in Mixed Games.
Career Earnings & Biggest Results
With over $503,000 in total live earnings, Ruiko Mamiya currently ranks 45th on the Japan All Time Money List. According to The Hendon Mob, her career-best live cash of TWD 3,087,700 (~$101,905) was achieved in November 2025 at the APT Championship Taipei, where she made history by winning the National Cup Championship. This victory followed a three-way deal and saw her overcome a massive 2,398-entry field to claim the title, trophy, and a Main Event seat.
The year 2025 has been a definitive breakout season for Mamiya, with tournament winnings exceeding $163,000. Her recent records include a string of high-stakes results across the United States, South Korea, and Taiwan:
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Winner, APT Championship Taipei National Cup (November 2025) for $101,905.
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Winner, APT Jeju Limit Dealer’s Choice – 7 Card Stud (September 2025).
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Runner-up, APT Jeju Draw Poker Masters (October 2025) for $4,911.
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8th Place, 56th WSOP $2,500 Mixed Omaha/Stud 8 or Better (June 2025) for $23,036.
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Winner, TMT Taipei Limit Lowball Triple Draw (July 2025).
Biography & Poker Background
Originally from Japan and currently residing in Tokyo, Ruiko Mamiya transitioned from a professional poker dealer to a full-time player after obtaining a dealer license in Las Vegas. She initially gained prominence in the Japanese community as “Mii-san,” securing her first major overseas title at the 2018 Asia Open Poker Tour in Korea. While she is a staple of major Asian festivals like the Asian Poker Tour (APT) and Japan Open Poker Tour (JOPT), she is a frequent traveler to the World Series of Poker (WSOP) in Las Vegas, where she has recorded deep runs since 2019.
Play Style & Strategy
Ruiko Mamiya is known for a resilient and grind-oriented tournament strategy, often excelling in Mixed Game formats and large-field No Limit Hold’em events. During her historic APT National Cup victory, she was noted for her ability to “slowly grind and build up little by little,” successfully navigating a short stack during three-handed play to eventually dominate the heads-up match. Her background as a dealer provides her with a unique perspective on table flow and player behavior, which she combines with a disciplined technical approach to Mixed Games like H.O.R.S.E. and Limit Triple Draw.
