Xeze
Smash Ace
Ryu is funny since even if he starts a Focus Attack in mid-air, d-air will win since it's a multi-hit move. FLUDD allows Mario to control the stage better and screw Ryu's recovery.
Here's a recent match where we can see Mario having the edge vs Ryu:
Here's a recent match where we can see Mario having the edge vs Ryu: