Originally Posted by Certinfy
No. If Del Potro beats Tipsarevic and Federer in straight sets he'll make the semi-finals. If Del Potro beats both but drops a set in either he'll be 2-1 on matches and 5-3 in sets and assuming Ferrer beats Tipsarevic he'll also be 2-1 on matches and 5-3 in set and and will take the place over Del Potro based on him winning the match between the pair.
Math is not your strongest side, is it?