Cartoon Girls Boxing Database

  Harley Quinn dreams about herself in a boxing match against Verdict.

https://www.youtube.com/watch?v=PLwjWadfcrs Erika Amano invites  Nagi Umino to join her on her kickboxing workout.

Cover art of Harley Quinn and Verdict in the ring.

  Variant cover of boxer Harley Quinn.

Tobaru-sensei imagines herself and Mitsuki Ooshiro as boxers. Still image.

Variant cover featuring Harley in gloves. 

https://youtu.be/WaVx-F0T84E?t=1918 https://youtu.be/PnO_402ka-k?t=2772 A couple of scenes involving Sasha working the heavy bag.