How good is McEnroe still?
I watched him play in the old fellas' tournament on TV last night against Agassi and then Rafter and was pretty impressed at his skill level for being well into his fifties now. I really hadn't seen him play much since his tour days, other than youtube clips but looked like he hit harder than in his youth, which isn't surprising given advances in racquets, etc. He's naturally a little slower but still seems very accurate with his defense, especially considering his opponents also hit harder than back in the day.
What would his USTA level be? Could he compete on the ATP tour still? Would he smoke Serena?