I think prime Ivanisevic would have a super good chance. He was the only one who was virtually equal on a consistent basis to a prime/peak Sampras on grass. They played 4 times at Wimbledon from 92-98 and while Sampras leads 3-1 it could have just as easily been 2-2 or even 3-1 for Ivanisevic, as he had huge chances to win the 95 and 98 encounters, and many of the stats favored him, but he couldnt win the important points and had numerous missed opportunities in both 5 set losses. He could have conceviably won 3 or 4 Wimbledons (and not just in a remove said player way ala Roddick) in that he had real chances of winning even with Sampras in the field in each of 92, 95, 98. He also made the 94 final but was pretty outclassed by Sampras that particular day. So in a field headed by old Djokovic on his worst surface, Kne-dal almost a decade after his grass prime, and grandpa Federer, I would give him a good shot.
Krajicek and Philippoussis would be hit or miss like they were then, but in a year they hit form they would have a good shot too. The depthless field would help them greatly in their primes though as unlike then there would be few people in early rounds to take them out even on a horrific day.
