The Simpsons Season 1 Episode 10 - Homer's Night Out
Homer takes Bart out to meet an exotic dancer and ends up at a Foxy Boxing Club. Only in the background with no punches landed.
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Glenn Martin, DDS - Season 1 Episode 6: We've Created a Mobster
Kids Wendy and Courtney try to make money and come across "Hottie Boxing". Two solid punches landed on one of the boxers.
Total Drama Season 5 Episode 7: Suckers Punched
http://www.youtube.com/watch?v=GY2-HToZWsQ Gwen and Courtney must box each other in a team challenge. A few punches are landed, but most of the action is shown off screen and the fight ends when the two make up.