PARIS, May 28, 2018 (News Wires) - Another former French Open champion has exited the tournament in the first round as Stan Wawrinka lost a five-set battle with Guillermo Garcia Lopez of Spain. Looking a shadow of the player who won the title in Paris three years ago, Wawrinka struggled with his serve and hit an awful lot of unforced errors (72) in his 6-2, 3-6, 4-6, 7-6 (5), 6-3 loss. Wawrinka, a three-time Grand Slam winner who was runner-up in Roland Garros last year, has been hampered by knee problems that forced him to miss three months of the season. He had won just one match on clay heading to the French Open and entered the tournament at No. 30, his worse ranking since 2008.