Let's go with sepia, because Fed is so old school
Old school? Then "Fed Noir" in B&W. Then Boggie with a racket.
Since Fed is flying let's highlight his motion with this splashed paint effect. Roger's moving so fast he's warping reality :)
Finally, from the splashed paint let's jump to a painterly-effect, with brush strokes and textures. Fits a "classic artist of tennis", don't you think? Hope you enjoyed these.