Defending champion Iga Swiatek celebrated her 20th birthday with victory over Slovenia's Kaja Juvan in the French Open first round.
The Polish eighth seed beat her best friend on the tour 6-0 7-5.
"She didn't give me any birthday gifts so I'm really happy I could win those important points," Swiatek said in her on-court interview.
But 2019 US Open champion Bianca Andreescu became the highest-ranked player to exit the women's draw.
The Canadian sixth seed lost 6-7 (1-7) 7-6 (7-2) 9-7 to world number 85 Tamara Zidansek of Slovenia.
There was also disappointment for Dutch 16th seed Kiki Bertens, who was beaten 6-1 3-6 6-4 by Slovenia's Polona Hercog.
British number one Johanna Konta, seeded 19th, is playing Romanian Sorana Cirstea after compatriot Heather Watson lost 6-4 7-5 to Kazakhstan's Zarina Diyas earlier in the day.
Among the other players who are opening their campaigns on Monday are American 23-time Grand Slam champion Serena Williams, who faces Romanian Irina-Camelia Begu in the French Open's first night session (20:00 BST).
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