AMSa

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Masaya Chikamoto, known as aMSa, is a Japanese professional Super Smash Bros. Melee player famous for playing Yoshi. Born October 27, 1991 in Hyōgo Prefecture, Japan, he began competing professionally in 2013 and is notable for being the only top-10 player who mains Yoshi.

Career highlights
- Early on, he defeated top player Mew2King.
- 2014 Apex finished 9th; 2015 Apex finished 5th.
- In 2022, he won The Big House 10 (the first major Melee tournament won with only Yoshi), Apex, and Scuffed World Tour, and was ranked the second-best Melee player by SSBMRank.
- In 2024, SSBMRank ranked him fourth.

Team and sponsorship
- Signed with Red Bull in 2019.
- Moved to Vancouver, Canada in 2022 to compete more in North America.
- Joined Golden Guardians in March 2023; the roster was disbanded on November 30, 2023.

Personal life
- He moved back to Japan after living in Canada.
- Married on May 16, 2023.
- Streams as aMSaYoshi on Twitch, with about 58,000 followers as of July 2025.