Both men have shown that they're in good form in the early stages of the competition, pulling off some audacious efforts that have gotten the audience on their feet. 

Roger Federer's between the legs shot was the talk of the tournament and the internet earlier today when he managed to loft a shot over Sam Querrey on his way to a straight sets (6-4 6-2 6-2) victory today.

For his part, Gael Monfils also hit a ridiculous return yesterday off Pablo Carreno's serve that bounced on his opponents' side of the net, before looping back over and bouncing on his side.

So, who hit it better?