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Three-time Grand Slam champion Stan Wawrinka blew a one-set lead to fall 4-6, 6-3, 6-2 to unfancied Dutchman Tallon Griekspoor in a first-round shock at the Rotterdam Open on Tuesday. The Swiss fifth seed slumped to another surprise defeat by an outsider, after losing in the Australian Open second round to Tennys Sandgren and in last week's Sofia Open semi-finals to Bosnian Mirza Basic. The 32-year-old Wawrinka, the 2015 Rotterdam winner, is struggling to regain top form after a pair of summer knee operations. The Swiss has now lost three matches and won three since returning in January. World number 259 Griekspoor, 21, earned the biggest success of his career as he competed in only his third ATP-level match. Wawrinka's devastating single-handed backhand was of scant use to him on the night, with his movement still well below his best. "It was a tough day at the office," Wawrinka said. "I still need a lot of work to get back. "There are a l...