VIDEO: Dimitrov brings in ringer from crowd to take a point from Federer

Grigor Dimitrov and Roger Federer faced off in an exhibition match Tuesday at Madison Square Garden, and a good time was had by all. Especially a young fan brought in from the crowd to play a point for Dimitrov. 

Wearing jeans and a hoodie, check out the lob the young man dropped over Federer's head and inside the line:

Federer's reaction was great. Sometimes all you can do is bite your shirt.