Top Seed Federer Survives Three-Set Tsonga Challenge     Top seed Roger Federer had to pass a major test against Jo-Wilfried Tsonga 7-6(5), 4-6, 7-5 to reach his 17th Halle elite eight on Thursday. “I thought it was tough but for me, the key was clearly to stay positive because I wasn't down in the score, it was just only even at one-set all, and … [Read more...] about Top Seed Federer Survives Three-Set Tsonga Challenge