The great american, who was a great rival of Borg is joint ninth as well. He won 8 Grand Slams of 15 Finals. He failed to win the Career Grand Slam because he was another player in this count down, who could not win the French Open, making the Semi-Finals 4 times. His first Grand Slam was the Australian Open in 1974. The same year he won the US Open and Wimbledon but did not participate in the French Open, accounting for his failure for a season Grand Slam. He won 5 of his 8 Grand Slams at the US Open. Though he didn't win the career Grand Slam, he won Grand Slams on all 3 surfaces, after winning the US Open in 1976 when it was on clay. He also won the US Open on all 3 surfaces, the only man to do so. Connors was world number 1 for a total of 268 weeks in his career, including 160 consecutive weeks, which was a record before Federer smashed it. He also won the most matches in the history of the game and played in 401 tournaments, which was a record until 2008. He has been in an incredible 31 Grand Slam Semi-Finals, even after playing in only 2 Australian Opens. He was in a great 12 consecutive Semi-Finals at the US Open. His consistency is shown by him being in the top 10 for 16 consecutive years as well as year end number 1 for 5 consecutive years. Also his 107 titles is the most ATP singles titles won in Open Era. In 1996 he retired, after 24 years.