 The season was statistically one of the most dominant in the Open Era . He won 11 singles titles , which tied his 2004 season as the most in over two decades , his 81 match victories were the most since Pete Sampras in 1993 , and his record of 81 – 4 ( 95 @.@ 2 % ) remains the second @-@ best winning percentage in the Open Era behind only John McEnroe in 1984 . 
