The 13th-seeded Wozniacki lost 7-6 (5), 4-6, 6-2 on Tuesday to 64th-ranked Yanina Wickmayer of Belgium.
It’s the first time Denmark’s Wozniacki was beaten in her opener at Roland Garros since 2007, her debut at the clay-court Grand Slam tournament.
Wozniacki was ranked No. 1 in 2010, a year after she reached the final of the U.S. Open. She’s been as far as the semifinals three other times at Grand Slam tournaments.
Last week, McIlroy announced he and Wozniacki mutually decided to split only days after sending out wedding invitations. They began dating in 2011.
On Sunday, McIlroy won a European Tour event in England.
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