Right Now Kapow - Season 1 Episode 11: Innocence of a Child/Story of a Life
A sketch about a boxer with a soft left punch. She's still undefeated. Only real punch landed is a right to the gut.
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Rugrats Go Wild (2003)
Debbie Thornberry practices kickboxing. Quick scene of bagwork that ends up knocking her down.
OK K.O.! - Short Episode 6: Enid's Bad Day
https://www.youtube.com/watch?v=_QLCiwQ6Mgg A crowd of impatient customers get on Enid's bad side. One background girl is seen wearing boxing gloves,
Snoopy, Come Home (1972)
Snoopy accepts Lucy's challenge to a boxing match. Pretty one sided with Snoopy scoring most of the 'punches'.
The New Batman Adventures - Season 1 Episode 1: Holiday Knights
Poison Ivy punches Batman with an oversized boxing glove. One punch. Quick scene.
Princess Punchalot
https://youtube.com/watch?v=eXr7TZybhJc Princess Punchalot fights Throwafista to return her kingdom's stolen core gems. Good back and forth.
Web Animations?
Trying to expand the criteria to amateur (but still decent looking) animations. Stuff from YouTube, Vimeo, dailymotion, etc. Please provide original sources from the creators themselves.