Andrea Petkovic had plenty to be philosophical about when she considered retiring from tennis after a succession of injuries saw her drop out of the top 10 and plummet to 143rd. Fast forward 18 months, the 26-year-old German is into a Grand Slam quarterfinal again after beating unseeded Kiki Bertens 1-6, 6-2, 7-5 at the French Open on Monday. Petkovic also reached the quarters at the Australian Open and French Open that year, achieving a career-high ranking of No. 9. More...