Jankovic, who finished 2008 at No. 1 in the rankings after playing in her only Grand Slam final at that year’s U.S. Open, broke Kvitova to get back on serve at 4-4 in the second set, and then broke again to force a deciding set.“Playing on grass is very difficult for me. It does not come natural,” said Jankovic, a Serb seeded 28th at this year’s tournament. “I just tried to stay one point at a time, just hang in there, stay positive and fight, and I made it.”