FF (2013) - Vol. 2 #12
Dragon Man has Miss Thing and She-Hulk test out new modifications he made to the Thing exo-suit in a boxing match. Both get one punch in.
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DC Super Hero Girls - Season 1, Episode 24: #SoulSisters Part 1
Diana Prince tries to do some sparring with Tatsu Yamashiro, but Tatsu's mind is elsewhere.
Time Bokan 24 - Episode 8: Seton Animal Chronicles Was Actually Donut Chronicles!
https://www.crunchyroll.com/time-bokan-24/episode-8-seton-animal-chronicles-was-actually-donut-chronicles-720941 Calen shows off her policewoman outfit with some boxing moves.
Godannar - Episode 2: Burning Virgin Road
Anna Aoi works a bag while training to become a mecha pilot. Quick scene.
Boneyard #7 (2002)
Abbey the vampire fights Ralph the werewolf in a charity boxing match. Some good back and forth action.