Grigor Dimitrov backs Rafael Nadal opponents to use cheeky tactic at French Open
Dimitrov was on the receiving end of a number of underarm serves during his five-set victory against Jared Donaldson at the French Open.
The Bulgarian was caught way beyond the baseline on the first occasion but when Donaldson tried his luck against Dimitrov and won the point.
The tactic is often frowned upon by tennis stars as they feel it is against the spirit of the game - although it is within the rules.
Nadal is notorious for standing way back when returning a serve and Dimitrov thinks it would be a handy tool to use against the world No 1.