2 classics for me
"You're calling an asswipe a guy who's just played in a grand slam semifinal, while you're sitting on your ass watching TV all day long. Get a grip. And Murray is not winning tomorrow, so be sure to have that celebrating party with your mother tonight"
this one even better..
"Stop vomiting, Feldman, seriously! It's not funny, not the least! It does show you are not a sports fan though, switch to politics, that's the place for bastards like you