Wimbledon 2016: Fourth seed Stan Wawrinka loses to Juan Martin del Potro 3-6, 6-3, 6-7 (2), 3-6 in second round
Wimbledon 2016: Fourth seed Stan Wawrinka loses to Juan Martin del Potro 3-6, 6-3, 6-7 (2), 3-6 in second round
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