Djokovic - Del Potro
Federer - Tsonga
you heard it here first
Del Potro should qualify if he beats Tipsy in 2 and Fed beats Ferrer in 2 as expected. Federer will secure first place even before the last match with JMDP in the night session.
With a semifinal vs probably Murray hours later, Federer would be daft to go all out vs JMDP, after all we all know what happened the last time he faced Murray after slugging it out with JMDP, and this time he won't even have a day's rest, only a few hours, especially since it will be the night match,