I think Sampras would compete just fine and make some needed adjustments. The guy switched from a two hander to a one hander and made that switch while he was becoming a top flight junior player, so he has proven himself to be adaptable in terms of needed tweaks in stroke mechanics. Plus, he was a fabulous competitor and athlete. I think he'd be a big threat to win any of the majors except the French Open perhaps. Yet, with the right draw, who knows even there in my opinion. I think he'd hold his own against any of the top 4.
No one could manufacture a man that won 6 French Opens and 5 Wimbledon titles in a row. - Andrew Longmore