Caroline Wozniacki's return to tennis and the public eye after her breakup with golfer Rory McIlroy ended in more pain on Tuesday when the 13th seed was knocked out of the French Open by Belgium's Yanina Wickmayer.

The 23-year-old Dane vowed to move on with her life after Wickmayer won a rousing baseline battle 7-6 (5), 4-6, 6-2, condemning Wozniacki to her first opening-round defeat at Roland Garros since her debut in 2007.

At the post-match media conference, the former world No 1 made a short statement, then said she would not answer questions about her private life.