Who is the greatest open-era male player on their weakest surface? The contenders that come to my mind are as follows. Laver- Hard to dispute thsi man's adabtability accross the surfaces. Although clay was Laver's weakest surface his record on clay was amazing. With 2 French Open titles too his name he was in no way weak on the dirt. Note that Laver's performances on Hard Court do suggest that clay was his weakest surface. Connors- relativly untested on red clay given his ban from the French Open during his prime years, but still undoubtably a force to be recconed with and a great green clay record. Borg- Hard courts or indeed decoturf courts seems too general a way to describe Borg's weakest surface. After all it was an atmosphere that Borg struggled with in the US and not really the surface. However deco-turf still has to be Borg's weakest surface even if it is infact merely that deco-turf correlated with night sessions and noisy crowds that caused Borg to struggle. Lendl- Frustrated by coming close but faling at Wimbledon he was still no slouch on grass. Apart from his 2 finals he had tough semi-finals there too against players such as McEnroe in 1984. Agassi- Grass is probabely Agassi's weakest surface. However with a Wimbledon title to his name another final loss to a awsome Sampras performance is very respectable. Due to the shortness of the grass court season there are no real other measures of Agassi's grass court strength, although it may suprise some to realise that 1992 Wimbledon was Agassi's only grass court title. Federer- Few clay court oponents have caused Federer problems since he hit good form in 2003. Federer's French Open losses since then have come to truely great clay courters in the form of Kuerten in 2004 and Nadal the other years. 4 Hamburg titles shows his quality on the red dirt.