Stan Wawrinka's glorious career - which brought him three Grand Slam titles in a golden era - ends after an honourable defeat on an emotional night in Basel. Swiss tennis star Stan Wawrinka, a three-time Grand Slam champion who competed alongside the sport's greatest names, is retiring. The 41-year-old Swiss announced earlier in the season that his last tournament as a professional would be the ATP 500-level event in his home country.