By Julien Pretot PARIS (Reuters) -Four-times champion Iga Swiatek clawed her way back from the brink to qualify for the French Open quarter-finals as she beat her clay court nemesis Elena Rybakina after a high-octane decider on Sunday. The fifth-seeded Pole looked out of sorts as she trailed 6-1 2-0 on Court Philippe Chatrier, leaving the crowd stunned, but Swiatek found her groove and some grit