SYDNEY, Australia (AP) Juan Martin del Potro's comeback from injury has briefly stalled with a 6-2, 7-5 loss to Germany's Florian Mayer in the second round of the Sydney International. After ...

Swiss third seed Stan Wawrinka outlasted tiring former champion Juan Martin del Potro in four sets to advance to the semi-finals of the US Open on Wednesday. Two-time grand slam winner Wawrinka ...