PARIS — Iga Swiatek shook off a bit of a dip in the first round of the Paris Olympics tennis competition and grabbed the last four games to beat Romania’s Irina-Camelia Begu 6-2, 7-5 on Saturday under a closed roof at Roland-Garros, the site of the No. 1-ranked Polish player’s four French Open titles.

Swiatek, who won a third consecutive championship at Court Philippe Chatrier just seven weeks ago, got broken in that same stadium to trail 5-3 in the second set before getting back to her usual clay-court expertise. She wrapped up the victory by breaking at love when Begu double-faulted on the last point.

Day 1 of tennis began with showers that might have contributed to slow lines for umbrella-toting spectators at the facility’s security checks near entrances and postponed by hours the start of matches at the 10 courts without retractable roofs.

Italy’s Jasmine Paolini, the No. 4 seed who was the runner-up to Swiatek at the French Open in June and to Barbora Krejcikova at Wimbledon two weeks ago, was the first tennis player to win a match at these Summer Games, eliminating Romania’s Ana Bogdan 7-5, 6-3 on Court Suzanne Lenglen.

Coco Gauff, the female flag-bearer for the United States on Friday, was slated to make her Olympic debut Saturday with Jessica Pegula in doubles. Gauff won the French Open doubles title with Katerina Siniakova last month and the US Open singles trophy in September.

Three years ago, Gauff missed the Tokyo Games after testing positive for COVID-19 right before she was supposed to fly to Japan.