Another thing to keep in mind is that we've been speaking strictly of 1st serve points. McEnroe, when he had his 2nd serve returned, was still winning 49% of the time. Tanner was at 41%.
So on 2nd serve you'd just reverse Moose's suggestions above: it's possible that Tanner was making more volley errors than Mac, and/or that Borg was making better returns against Tanner's 2nd serve than he was against Mac's 2nd.
Independently of any stats I would have said that McEnroe's second serve was better than Tanner's. But the stats illustrate it. For example McEnroe drew 20 return errors with his second serve. Tanner drew just 9, despite serving more second serves than Mac did (78-67).
Last edited by krosero; 10-28-2011 at 05:28 PM.