PARIS -- Venus Williams bounced back from a poor start at the French Open on Sunday, beating 19-year-old Paula Ormaechea 4-6, 6-1, 6-3 in her first Grand Slam match since revealing she has been diagnosed with an autoimmune disease.

The seven-time major champion seemed taken aback by her opponent's early aggressive play, but still managed to turn the match her way and reach the second round.

The 31-year-old Williams, a former top-ranked player who is now No. 53, is 12-4 this season.

Williams pulled out of the U.S. Open last August before her second-round match, saying she had Sjogren's syndrome, an autoimmune disease that can cause fatigue and joint pain. She returned to the tour in March.