Very nice thread, thank you!
#2 should be obvious to anyone... by the weights...
For #7 I'd guess Mika by the muscularity, but could be e.g. Ortmann as well...
For #4 I might have said Mosconi, but then again, the picture is quite obviously from a film, so yeah, Paul Newman. As is #6 I'd say.
For the others, I would have to be only guessing, so I won't. The watches on the wrists would give a clue if one would like to do some googling.
edit. For #5, that's van Boening, isn't it? The bridge matches and no one else that I can think of uses a glove of that color.