Studio Killers 404
An animated pilot airing on December 17. Features a female boxing unicorn.
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Gokusen - Season 1, Episode 12: Goodbye, Yankumi
Yankumi has her students compete against the top ranked boxing club in Japan to keep her job as a teacher. Her fight isn't actually shown.
Tear Along The Dotted Line - Season 1, Episode 6
SPOILER: A look back at Alice's life as a boxer is given during her eulogy.
Lupin III: Part II - Episode 96: Lupin's Gourmet World
https://www.crunchyroll.com/lupin-the-third-part-2/episode-96-lupins-gourmet-world-685651 Fujiko Mine uses boxing gloves to extract a villain's diamond dentures.