the few who dominated amateur and professional tennis during the late 1940s and early 1950s. Tony Trabert has said that of the players he saw before the start of the Open Era, Kramer was the best male champion. By the 1960s, Budge and others had added Pancho Gonzales and Lew Hoad to the list of contenders. Budge reportedly believed that Gonzales was the greatest player ever. Gonzales said about Hoad, "When Lew's game was at its peak nobody could touch him. ... I think his game was the best game ever. Better than mine. He was capable of making more shots than anybody. His two volleys were great. His overhead was enormous. He had the most natural tennis mind with the most natural tennis physique." Before and during the Open Era, Rod Laver remains the only male player in history to have won the calendar year Grand Slam twice in 1962 and 1969 and also the calendar year Professional Grand Slam in 1967. Jimmy Connors, Björn Borg, and John McEnroe had a fierce rivalry in the late 1970s and early 1980s that propelled "the men's game to new heights of popularity". Connors had a long and prolific career and holds the Open Era men's singles records of 109 titles including eight Grand Slams, 1,557 matches played, and 1,274 match wins. Borg was regarded by his contemporaries as among the greatest ever, having a calm court demeanor and unrivalled physical conditioning, winning six French Opens and five straight Wimbledon titles, retiring at age 26 when he was still in his prime. McEnroe attained the No. 1 ranking in both singles and doubles, finishing his career with 77 singles and 78 doubles titles; this remains the highest men's combined total of the Open Era. The Agassi–Sampras rivalry showcased the two best players in the 1990s. Andre Agassi, the first of two male players in history to have achieved a Career Golden Slam in singles tennis (followed by Rafael Nadal), has been called the best service returner in the history of the game. Agassi was the first man to win grand slams on all modern surfaces (hard, grass, and clay court, as previous holders of all grand slam tournaments played in an era of grass and clay only), and is regarded by a number of critics and fellow players to be among the greatest players of all time. Both Rod Laver and Ken