Spanish MotoGP rider Marc Marquez, during the warm-up ahead of the Indonesian Grand Prix in Mandalika. Photo: AFP
Ducati's Marc Marquez suffered a collarbone injury as a result of a collision with Marco Bezzecchi at the Indonesia Grand Prix, his team said.
Rookie Fermin Aldeguer won the event.
In the first lap of the race on Sunday, Bezzecchi collided with the rear of Marquez's Ducati and the pair both hurtled into the gravel at high speed, with Marquez appearing to be in significant discomfort after tumbling head over heels.
The Spaniard, who won his seventh MotoGP championship at last week's Japanese Grand Prix, was hunched over on the side of the track for a couple of minutes before staggering to his feet and lurching away while clutching his shoulder.
He was later seen with his arm in a sling, with members of Ducati team saying on the race's broadcast that there was evidence of a fracture after initial scans.
"As a result of today's crash at Indonesian GP, Marc Marquez has suffered an injury to his right collarbone," Ducati said in a statement on social media.
"The Spanish rider will travel tonight to Madrid (Spain) for further medical tests and to decide on the treatment to follow."
The injury was on the shoulder of the arm Marquez fractured in the 2020 July season-opening Spanish Grand Prix in Jerez, which ruled him out for an extended period and required several surgeries.
In a separate statement, Aprilia confirmed that Bezzecchi would also be taken to hospital to undergo a more comprehensive examination following the crash.
The crash continued a dreadful streak of luck for Marquez at the Mandalika International Circuit, where he has never been able to finish a grand prix in four attempts.
There did not appear to be any bad blood between Bezzecchi and Marquez, however, as they shared a quick handshake before Marquez was taken to the medical centre.
Marquez's Ducati team-mate Francesco Bagnaia, Joan Mir (Honda HRC) and Enea Bastianini (Red Bull KTM Tech3) also crashed out of Sunday's race.
Rookie Aldeguer earned the first victory of his fledgling MotoGP career, surging past past KTM's Pedro Acosta to take the lead in the 10th lap, eventually finishing well clear of the competition.
The win will have helped Aldeguer erase the pain of his second-placed finish in Saturday's sprint, where he led for most of the 13-lap race before finishing second behind Bezzecchi.
Acosta was second, with Aldeguer's teammate Alex Marquez completing the podium.
"I can't believe it, no. I'm super happy. I have a lot of words to say," said Aldeguer, who became the first rookie to win a race since Jorge Martin in 2021.
At 20 years and 183 days old, Aldeguer also becomes the second-youngest rider to ever win a MotoGP race after Marquez at 20 years and 63 days.
Earlier on Sunday, KTM Ajo's Jose Antonio Rueda won the Moto3 race in Indonesia to clinch the 2025 title.
Southlander Cormac Buchanan finished 16th in Sunday's race.