they can play at the same level as the pros for a day, maybe not an entire match even, maybe just a set, or maybe a match, depending.
Edberg can beat Safin, who just retired.
I would say that a lot of them don't need their opponents to go easy in exhos to win or get a close match. They are good enough for one match, but they need a cooldown.
@The-Champ, would be great to see JMac and Fed v. Borg and Rafa doubles exho. would be very interesting. In fact, would be great on wimby, where all of them won it