Fabio Quartararo turned off his television to avoid witnessing Francesco Bagnaia's title celebrations before quickly turning his attention to reclaiming his MotoGP crown next year.

Quartararo's hopes of retaining his championship were slim heading into Sunday's season-closing Valencia Grand Prix.

The Frenchman needed to win the race while seeing rival Bagnaia finish no better than 15th.

Instead, Quartararo could only manage fourth, while Bagnaia crossed the line in ninth to secure an ultimately comfortable title triumph.

The dethroned champion's pain was clear after the race, but he sought to focus on the positives, using his frustration as motivation for 2023.

"That's the positive and the negative side, of course," Quartararo told BT Sport. "It hurts a lot – I had to turn off the TV.

"But it's motivation to say, 'okay, we lost the title, but I will be back'. The team is working super hard, so there is no reason we cannot fight for the championship next year."

Quartararo referenced "an up-and-down season", which included "quite a lot of struggle", but there is optimism ahead of a post-season test on Tuesday.

"It will be really important," he said. "I want to always be in the top position, and I will try my best. I will work super hard, and I am pushing the team to make the same.

"I think next year is going to be a good year, and hopefully we can really bring a performing bike to fight with them."

Miguel Oliveira won a delayed Indonesian Grand Prix on Sunday as he held off a late surge from world champion Fabio Quartararo.

Quartararo had qualified in pole position but dropped to fifth in the difficult conditions as Oliveira built what proved to be an unassailable lead.

Champion Quartararo was on a run of four consecutive races without a podium finish but produced a brilliant ride in the second half of the race to take second ahead of Johann Zarco.

Jack Miller, who led in the early stages, finished fourth and Alex Rins fifth, with Enea Bastianini, winner in Qatar's season opener, down in 12th.

Six-time world champion Marc Marquez was forced to miss the race after a heavy crash during the warm-up left him with concussion.

The action got underway after more than an hour's delay, during which torrential rain fell and lightning struck the edge of the track, with the race shortened to 20 laps.

Miller and Oliveira pulled away from Quartararo after adjusting more quickly to the conditions and the latter surged into the lead as his pace became too much for the Australian.

Jorge Martin crashed at Turn 1 after catching a puddle with his front wheel, highlighting just how treacherous the track remained even after the rain had ceased and the surface began to dry.

Quartararo overtook Rins with eight laps to go before passing Miller and Zarco in a gripping battle for a podium place, the French rider eventually pulling away.

There was not enough time to catch Oliveira, though, the Red Bull KTM man claiming his fourth career win in exemplary fashion.

TOP 10

1. Miguel OIiveira (Red Bull KTM)
2. Fabio Quartararo (Monster Energy Yamaha) +2.205 seconds
3. Johann Zarco (Pramac Racing) +3.158s
4. Jack Miller (Ducati) +5.663s
5. Alex Rins (Suzuki Ecstar) +7.044s
6. Joan Mir (Suzuki Ecstar) +7.832s
7. Franco Morbidelli (Monster Energy Yamaha) +21.115s
8. Brad Binder (Red Bull KTM) +32.413s
9. Aleix Espargaro (Aprilia) +32.586s
10. Darryn Binder (RNF Racing) +32.901s

CHAMPIONSHIP STANDINGS

Riders

1. Enea Bastianini (Gresini Racing) 30
2. Brad Binder (Red Bull KTM) 28
3. Fabio Quartararo (Monster Energy Yamaha) 27
4. Miguel OIiveira (Red Bull KTM) 25
5. Johann Zarco (Pramac Racing) 24

Teams

1. Red Bull KTM 53
2. Monster Energy Yamaha 41
3. Suzuki Ecstar 40
4. Repsol Honda 31
5. Gresini Racing 30

Jack Miller won the Spanish Grand Prix as the Ducati rider notched his first MotoGP victory since 2016.

The Australian made a superb start to lead and, despite being passed by Fabio Quartararo (Monster Energy Yamaha) in the middle stages, he held his nerve in the second half of the race to return to the front.

Miller finished ahead of Ducati team-mate Francesco Bagnaia with Franco Morbidelli (Petronas Yamaha SRT) in third spot.

Quartararo slipped down to finish 13th as he surrendered his place at the top of the world championship to Bagnaia.

The Frenchman started poorly as he slipped from pole position to fourth as Miller surged ahead, but like the Portuguese Grand Prix last time out he initially recovered.

Quartararo overtook his rivals on the final corner of successive laps to regain the lead before he pulled one-and-a-half seconds clear at the front.

With 11 laps to go, a third consecutive victory seemingly beckoned for Quartararo, but he dropped two seconds on one lap, allowing Miller to seize the advantage.

Miller was able to hold on until the end as he secured his first MotoGP win since the Dutch TT at Assen in June 2016 and his eighth overall.

Quartararo lost further ground as Italian duo Bagnaia with Morbidelli scrapped it out for second, with the former edging it to make it a one-two for Ducati.

Six-time MotoGP champion Marc Marquez (Repsol Honda) returned to the Jerez track where he suffered a broken arm last July –  an injury that kept him out for nine months – and came through unscathed.

Marquez, who had escaped injury in a big fall on Saturday and another accident in warm-up, started the race in 14th spot and eventually ended in ninth in his second race since returning.

Takaaki Nakagami (LCR Honda Idemitsu) claimed fourth place as Joan Mir (Suzuki Ecstar) and Aleix Espargaro (Aprilia) both secured top-six finishes.

TOP 10

1. Jack Miller (Ducati) 41'05.602
2. Francesco Bagnaia (Ducati) +1.912
3. Franco Morbidelli (Petronas Yamaha SRT) +2.516
4. Takaaki Nakagami (LCR Honda Idemitsu) +3.206
5. Joan Mir (Suzuki Ecstar) +4.256
6. Aleix Espargaro (Aprilia) +5.164
7. Maverick Vinales (Monster Energy Yamaha) +5.651
8. Johann Zarco (Pramac Racing) +7.161
9. Marc Marquez (Repsol Honda) +10.494
10. Pol Espargaro (Repsol Honda) +11.776

CHAMPIONSHIP STANDINGS

Riders

1. Francesco Bagnaia (Ducati) 66
2. Fabio Quartararo (Monster Energy Yamaha) 64
3. Maverick Vinales (Monster Energy Yamaha) 50
4. Joan Mir (Suzuki Ecstar) 49
5. Johann Zarco (Pramac Racing) 48

Teams

1. Monster Energy Yamaha 114
2. Ducati 105
3. Suzuki Ecstar 72
4. Pramac Racing 65
5. Repsol Honda 40

What's next?

Quartararo will hope for more luck on home turf at the French Grand Prix at Le Mans on May 16.

Fabio Quartararo overcame a poor start to win a dramatic Portuguese Grand Prix that saw Marc Marquez finish seventh on his long-awaited return.

Marquez said he was ready to "suffer" in his first race since sustaining a season-ending broken arm last July, but the six-time MotoGP champion enjoyed an encouraging comeback after making an early move from sixth to third.

However, it was Quartararo who took the victory, despite dropping down the field from pole position in a pulsating start, after Johann Zarco and Alex Rins crashed out in quick succession at the Algarve International Circuit on Sunday.

Quartararo took over from Zarco as championship leader after sealing back-to-back wins following his triumph in Doha, with Francesco Bagnaia and Joan Mir taking second and third place respectively.

Maverick Vinales could only finish back in 11th place on a great day for Quartararo.

Zarco darted up the inside in a dream start from third on the grid to take the lead from Monster Energy Yamaha rider Quartararo, with Marquez also impressing during the opening laps in Portimao.

Quartararo dropped back to sixth and Marquez caught the back of Mir's Suzuki as he slipped back following a promising beginning to the race.

Rins, who started in second, moved passed Pramac Racing's Zarco in a flash at Turn 13 to hit the front before Jack Miller and Miguel Oliveira - winner on home soil last year - crashed out.

Quartararo had ominously put a disappointing start behind him to apply the pressure, becoming the latest leader of the race with 17 laps to go.

Rins tried his best to cut the gap in second place but spun off 11 laps from the end at Turn 10 after Valentino Rossi had crashed out from 11th place.

Quartararo was in complete control when Rins spun and a second-placed Zarco hit the deck, with Ducati rider Bagnaia holding off Mir for second, having been back in 11th, as the early championship lead changed hands.