Top Ten Single Season Winning Percentages On The ATP Tour

No.      Player          Year      Record          Winning %

1             J. McEnroe           1984            82-3                   .965

2.            J. Connors            1973            89-4                   .957

3.            R. Federer             2005           81-4                   .953

4.            R. Federer             2006           92-5                   .948

5.            J. Connors             1974           95-6                   .941

6.             I. Lendl                1985           80-6                   .930

7.             B. Borg                1979           76-6                    .927

8.             R. Federer            2004           74-6                    .925

9.             I. Lendl                1982          106-9                   .922

10.            B. Borg                1977          76-8                    .906