Despite being turned away again as he attempted to earn his record-setting 25th Grand Slam title, Novak Djokovic seemed upbeat about his future.Minutes after being on the wrong end of a convincing 6-4, 6-4, 6-4 defeat to defending champion Jannik Sinner in Friday's second semifinal on Center Court at Wimbledon, the 39-year old told reporters he plans to return to London next summer.