Table 1. Percentage comparison of the stances used when hitting forehands in a set of clay court and grass court tennis in matches performed by Roger Federer (RF)-Alejandro Falla (AF).

Court	Stroke	Open		Square		Closed
		RF	AF	RF	AF	RF	AF
Clay	Forehand	77	72	13	12	10	18
	Backhand	6	36	22	43	72	21
Grass	Forehand	72	34	19	41	9	25
	Backhand	6	10	26	48	68	42