Start of play at the French Open between local hope Ugo Humbert and Ricardas Berankis of Lithuania was delayed on Tuesday due to a suspiciously parked vehicle outside Roland Garros, the organisers said.
A loud sound was heard outside the 5,000-seat stadium, built on the premises of the neighbouring botanical garden, and play started on Court Simonne-Mathieu about 25 minutes later than schedule.
French Tennis Federation (FFT) said the start was delayed due to security officials neutralising a vehicle illegally parked outside the stadium.
"It was a routine security intervention by the police," an FFT spokesman told Reuters. "Everything is back to normal."
A police source said the vehicle was a stolen car and security checks confirmed there were no explosives attached.
Matches on the other courts on the third day of the clay court Grand Slam started on time.
Meanwhile, Russian seventh seed Andrey Rublev was upset 6-3 7-6(6) 4-6 3-6 6-4 by unseeded German Jan-Lennard Struff in the opening round.
Rublev made 47 unforced errors in the 3 hour, 46 minute marathon, while Struff sent down 63 winners, including 25 aces.
Local favourite Gael Monfils came back from a set down to beat Spain's Albert Ramos Vinolas 1-6 7-6(6) 6-4 6-4.
The Frenchman, who is seeded 14th this year, sent down 12 aces and 60 winners, but also made a whopping 75 unforced errors.
More to follow...