Rosewall also won major Pro Slam tournaments on all three surfaces (grass, clay, hard court) Rosewall in 1963 and Laver in 1967. Pete Sampras had a precise and powerful serve, set the record of six consecutive year-end No.1 finishes, and was the first player to break Roy Emerson's record of twelve Grand Slams. Sampras retired with a then-Open era record of fourteen Grand Slam titles which was by far the most among his contemporaries, as the second-most Slams held at the time by another active player was Agassi with seven. Earlier in Sampras' career, the most Grand Slams won up to that point by other active players was eight (jointly held by Jimmy Connors and Ivan Lendl). By the early twenty-first century, the "Big Three" of Roger Federer, Rafael Nadal and Novak Djokovic had dominated. As of 2023, Nadal and Djokovic hold the record for the most grand slam titles with 22. Greatest female players As with the men there are frequent discussions about who is the greatest female singles player of all time with Steffi Graf, Martina Navratilova and Serena Williams being the three players most often nominated. In March 2012 the Tennis Channel published a combined list of the 100 greatest men and women tennis players of all time. It ranked Steffi Graf as the greatest female player (in 3rd place overall), followed by Martina Navratilova (4th place) and Margaret Court (8th place). The rankings were determined by an international panel. Sportswriter John Wertheim of Sports Illustrated stated in an article in July 2010 that Serena Williams is the greatest female tennis player ever with the argument that "Head-to-head, on a neutral surface (i.e. hard courts), everyone at their best, I can't help feeling that she crushes the other legends.". In a reaction to this article Yahoo sports blog Busted Racket published a list of the top-10 women's tennis players of all time placing Martina Navratilova in first spot. This top-10 list was similar to the one published in June 2008 by the Bleacher Report who also ranked Martina Navratilova as the top female player of all time. Steffi Graf is considered by some to be the greatest female player. Billie Jean King said in 1999, "Steffi is definitely the greatest women's tennis player of all time." Martina Navratilova has included Graf on her list of great players. In December 1999, Graf was named the greatest female tennis