I was wondering about Borg versus Sampras in terms of each player’s slam titles. Borg has 11 titles on two radically different surfaces: 5 on the fast grass at Wimbledon, and 6 on the slow red clay at the French Open. Sampras has 14 slam titles: 7 at Wimbledon (fast surface), 5 at the US Open (fast surface), and 2 at the Australian Open (arguably fast surface?). What if player X has 12 slam titles--all on fast surfaces, and players Y has 12 slam titles—equally divided on 6 fast and 6 slow surfaces. Which is the tougher to accomplish? Is player X more narrow in his abilities? Is player Y more varied in his abilities? Does player Y have the greater achievement?