Federer - Fake drop shot/slice winner
Djokovic - Running BH, lobs.
Nadal - Banana
Murray - Hmm tough one. I'd say passing shots from both wings.
Ferrer - Inside out FH
Berdych - Inside out FH (cross court)
Tsonga - Kamikaze 'close your eyes and pray for it to land in' FH
Delpo - Flat FH
Tipsy - Flat FH