Bjorn Borg

Bjorn Borg’s 11 Grand Slams by age 25 remain unmatched in modern men’s tennis, powered by six French Opens and five consecutive Wimbledon titles. His career win percentage of 82.7% exceeds the average for any other player in the top 10 history, outperforming #8’s 81.4%. Borg's abrupt retirement at 26 cut short what could have been another 5+ Slams, a sacrifice no rival on this list has made.