A professional competitor since 2012, Maesawa is the former DEEP JEWELS Atomweight champion, having retired with the title after defending it twice.
[2][3] Maesawa was scheduled to make her professional debut against Mika Nagano at Jewels - 21st Ring.
[7] Maesawa faced Mina Kurobe at Jewels - 23rd Ring, and lost by a first-round submission, extending her losing streak to three fights.
[9] Measawa earned her second professional win with a first-round knockout of Yasuko Mogi at DEEP 64.
[16] At Deep Jewels 14, Maesawa submitted Emi Tomimatsu by a third-round rear naked choke.
[29] Maesawa was scheduled to fight Kanna Asakura in a non-title bout at Deep Jewels 23.
[32] Ham won the fight by a first-round technical knockout, stopping Maesawa through repeated knee strikes.
[33] After losing two non-title bouts back-to-back, Maesawa was scheduled to make her first title defense against Emi Tomimatsu at Deep Jewels 26.
[37] Maesawa made her second title defense against Hikaru Aono at Deep Jewels 30.