looks good, but you need to accelerate more the last frames, maybe your anim had 50 frames? cut the last 10 frames, that your anim have only 40 frames.
Your feet looks weird, make footsteps with planted key, isnt that hard
and fix the racket hand, when he finish the stroke, tha racket arm finish to ahead, move the hand to the back.
and fix the sweet spot also , the hit ball moment begins too early.
overall, is a good anim! but you need to fix some things