In response to the initial thread, there is no universal best due to individual taste.
Same with the tennis analogies. "My" opinion is that Agassi was the best, although Laver would make for a great discussion. I base my decision on the fact that Tennis is played on grass, clay and cement. If you are truly the best of the best, you should be able to win on all surfaces. Only Agassi has won all 4 of the Slams on different surfaces. Borg never won the US Open on cement. Connors, McInroe, Sampras never won the French on clay. Federer is something special and still has a shot at the French. Laver had no choice back then as there was only 2 surfaces, grass and clay, but he is 1 of only 2 men to ever win the Grand Slam and only "he" did it twice. Agassi/Laver, now that would be a good discussion. Someone may come around and win the French 25 times in a row but I wouldn't consider him the best IMO.
Same with the tennis analogies. "My" opinion is that Agassi was the best, although Laver would make for a great discussion. I base my decision on the fact that Tennis is played on grass, clay and cement. If you are truly the best of the best, you should be able to win on all surfaces. Only Agassi has won all 4 of the Slams on different surfaces. Borg never won the US Open on cement. Connors, McInroe, Sampras never won the French on clay. Federer is something special and still has a shot at the French. Laver had no choice back then as there was only 2 surfaces, grass and clay, but he is 1 of only 2 men to ever win the Grand Slam and only "he" did it twice. Agassi/Laver, now that would be a good discussion. Someone may come around and win the French 25 times in a row but I wouldn't consider him the best IMO.