Novak Djokovic opened his bid for a first Olympic gold medal with a 6-0, 6-1 victory at Roland Garros that could set up a second-round matchup with longtime rival Rafael Nadal.

No. 2 seed Carlos Alcaraz of Spain, the reigning French Open and Wimbledon champion, also opened with an easy 6-3, 6-1 victory over Lebanon’s Hady Habib.

Serbia’s Djokovic, who is seeded No. 1 in the men’s field after Jannik Sinner pulled out with tonsillitis, needed less than an hour to dismiss Australia’s Matthew Ebden, a doubles player participating in a tour-level singles match for the first time in two years.

Ebden got into the singles bracket because he was in Paris to play doubles and thus available when 16th-ranked Holger Rune of Denmark withdrew with an injured wrist.

Ebden’s lone game came after he was already down 6-0, 4-0 — and he celebrated by pulling the front of his yellow shirt over his head and baring his chest to roars from the flag-dotted crowd.

Djokovic has endured some Olympic disappointments, twice losing in the semifinals, with his only medal being a singles bronze in Beijing in 2008.

Nadal, the Spaniard who won a record 14 of his 22 Grand Slam titles at the French Open and owns two Summer Games golds, is scheduled to play his opening singles match Sunday. He was a surprise torch-carrier during the rain-soaked opening ceremony along the Seine on Friday night and was slated to compete alongside Alcaraz in doubles Saturday night.

“Playing him is like finals, in any tournament,” Djokovic said of the potential matchup with Nadal. “Particularly here, knowing what he has achieved and what he’s done for our sport, but particularly here at Roland-Garros, his record speaks for itself. I look forward to it. If we get to face each other, it’s going to be possibly the last time we’re going to face each other on a big stage. So I’m sure that people would enjoy it. I’m looking forward to it, and I’ll be ready for that matchup.”

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 at least 4½ hours the start of matches at the 10 courts without retractable roofs.

ESPN’s Coley Harvey, The Associated Press and Reuters contributed to this report.