I belive Agassi has the most complete singles record of any male tennis player (looking at open era achivements only). This is why in my mind he will always be a contender for the GREATEST player. Note I say GREATEST, not BEST. Agassi has the Career Grand Slam, the Olmympic Gold, the End of Year Tournament, and 7 of the 9 Master Series (more than any other player), Davis Cup In terms of completeness: Borg lacked the USO, Macenroe the FO, Sampras the FO, Lendl SW19, Connors FO, Federer FO. They all also lacked the Olympic Gold, which although some people think is worthless in tennis I think it has a value. Agassi has more different MS than both Sampras and Federer, undoubtably a worthy achivement as far as completness is concerned. He also has the Davis Cup, although this is a questionable achivement as if you have a good team you have a far better chance of winning (although Agassi's Davis Cup record of 30-6 [W-L] is undoubtably exceptional).