Happy Gilmore Rip-off
"Rowdy orphan excels at a gentleman's game he learned from his black mentor, thanks to his super-powerful serve/drive; goes on to play epic underdog match against his uptight, V-neck sweater-wearing rival."
Even has some lines and gags directly lifted...
Throw a Joe Dirt wig on Happy, give him Kenny Powers' ego (and coke habit), and you've got this movie.