Tuesday marked World Tennis Day, and in celebration, the sport's most talented players gathered for festivities at New York City's Madison Square Garden. Among the greats were Roger Federer and Grigor Dimitrov, who came out to play an exhibition and, in Dimitrov's case, to bend the rules a bit more than is usually allowed.
When the Bulgarian player wanted to take a short break, he pulled a very young fan from the stands and gave him the chance to play in his place against Federer. Within seconds, the kid had Federer down a point, thanks to a successful lob hit.