Most Masters Entries at Single Tournament

Rank	Country	Name	Masters Entries	Tournament
1	ESP	Rafael Nadal	20	Madrid Masters
2	USA	Andre Agassi	19	Miami Masters
2	ESP	Rafael Nadal	19	Rome Masters
4	SUI	Roger Federer	18	Indian Wells Masters
4	SUI	Roger Federer	18	Miami Masters
4	ESP	Feliciano Lopez	18	Miami Masters
4	ESP	Fernando Verdasco	18	Madrid Masters
4	ESP	Feliciano Lopez	18	Indian Wells Masters
4	ESP	Fernando Verdasco	18	Miami Masters
4	SUI	Stan Wawrinka	18	Rome Masters
4	SRB	Novak Djokovic	18	Rome Masters
12	USA	Andre Agassi	17	Indian Wells Masters
12	FRA	Fabrice Santoro	17	Monte Carlo Masters
12	ESP	Feliciano Lopez	17	Madrid Masters
12	ESP	David Ferrer	17	Miami Masters
12	SUI	Roger Federer	17	Rome Masters
12	SUI	Roger Federer	17	Cincinnati Masters
12	ESP	Rafael Nadal	17	Monte Carlo Masters
12	GBR	Andy Murray	17	Cincinnati Masters
12	SRB	Novak Djokovic	17	Paris Masters