Marc Marquez has been hit with a double long-lap penalty following his Portuguese Grand Prix crash on Sunday.

The six-time MotoGP champion started on pole in Portimao, but a costly mistake brought his race to a premature end.

Marquez ploughed into Miguel Oliveira at Turn 3 early in the race, resulting in both riders dramatically crashing out.

The Spaniard also forced Jorge Martin wide, which saw his compatriot lose several positions.

Marquez could miss the next round in Argentina, as he waits to discover if he suffered a fracture to the first metacarpal bone in his right hand.

If he is passed fit for that race, the 30-year-old will face a penalty after the stewards ruled that he was guilty of irresponsible riding.

Marquez said: "Honestly speaking, I am not worried about Argentina. Today, the most important is that Miguel is okay. Because I did a big mistake on Turn [3], in the first part, and this created everything.

"I braked and had a massive lock with the front tyre. That meant that I released the brakes. My intention was to go to the left side. But the bike stayed on a lean and I couldn't avoid going to the right side.

"I was able to avoid Martin but couldn't avoid Miguel. I was very worried for him because the contact was big.

"I already said it personally – but I want to say sorry to him, to his team, to the Portuguese fans. I have been penalised for that mistake with a double long lap penalty, that I completely, completely agree.

"But apart from that, I have a few injuries – my hand, my knee. We need to check. Let's see. At the moment it's not the most important, my situation."

Oliveira suffered from a contusion in his right leg on home soil in a race that was won by Francesco Bagnaia, who completed a double after his success in the sprint race on Saturday.

Francesco Bagnaia made it a perfect start to the MotoGP season by winning the Portuguese Grand Prix after Marc Marquez crashed out.

Bagnaia was victorious in the inaugural MotoGP sprint race on Saturday and the reigning champion crossed the line first again in Portimao a day later.

The Ducati rider started in second place behind Marquez, but the Spaniard's race came to an early end when he lost control and collided with Miguel Oliveira.

Oliveira had taken an early lead after starting in fourth place on home soil, but Marquez's mistake left him heading for the medical tent for a check-up after he was sent flying off his bike at Turn 3.

It was subsequently confirmed six-time world champion Marquez had suffered a fractured first metacarpal bone in his right hand.

Italian Bagnaia took over at the front on lap two following moves on Oliveira and Jorge Martin, then went on to complete a double ahead of Maverick Vinales.

Marco Bezzecchi joined his compatriot Bagnaia on the podium by taking third place, with Johann Zarco nipping in to take fourth in the closing stages ahead of Alex Marquez.

Martin crashed out with five laps to go at Turn 2 as Bagnaia took command and made it a dream start to the defence of his title. 

Johann Zarco says he was happy to give Francesco Bagnaia a helping hand in the MotoGP title race rather than push for a Thailand Grand Prix victory on Sunday.

Miguel Oliveira secured his second win of the season on a wet day in Buriram following a delayed start due to heavy rain, with Bagnaia third behind Jack Miller.

Zarco moved up to fourth as he thrived in drier conditions late in the race, but the Pramac Racing rider resisted the temptation to push for victory at the risk of damaging Bagnaia's title hopes.

With Fabio Quartararo only able to finish 17th, Ducati's Bagnaia reduced the defending champion's lead in the standings to only two points with three races to go.

Zarco said: "I was waiting for it to get drier, but it came a bit too late. The amount of water at the beginning of the race was difficult for me.

"The others had a bit more pace and I could not attack too much, I was sliding, so I've lost positions.

"Then it took time to get dry, if it could get dry a bit earlier I would have taken the advantage much earlier and could think about the victory.

"Four laps from the end I was there and two laps from the end almost fighting for the podium, but also hesitating a bit with Pecco as he is doing a great championship.

"I didn't want to make a mistake in the Ducati group. I was really hoping for victory today in these conditions, but I stayed fourth and it's good enough for me."

He added: "It's kind of being clever in the championship. I have lost too many points many races ago.

"I need to race to try to catch a victory, but I have nothing to fight for [in the championship battle], so that's why.

"We are a big group at Ducati, I think if we can sometimes give help in some way, I'm pretty glad the race has been like that."

Aleix Espargaro finished back in 11th and is 20 points adrift of Quartararo, while rookie Marco Bezzecchi crossed the line in 16th after starting on pole for the first time.

Fabio Quartararo endured a Thailand Grand Prix nightmare as Miguel Oliveira secured his second victory of the season on a wet Sunday in Buriram.

Quartararo's lead over Francesco Bagnaia in the battle for the MotoGP title is down to only two points with three races to go after the reigning champion could only finish 17th.

Bagnaia had been 18 points adrift of the championship leader after crashing out on the final lap in Japan last weekend, but reduced the deficit by taking third place at the Chang International Circuit, where Aleix Espargaro finished back in 11th

Oliveira secured a brilliant win after starting back in 11th, with Jack Miller second and Bagnaia holding on for the final podium spot under pressure from Johann Zarco and Marc Marquez.

Rookie Marco Bezzecchi retained his lead following a delayed start due to heavy rain, but had to drop into second behind Miller as punishment for exceeding track limits at Turn 1.

Quartararo plummeted from fourth to 17th on the opening lap, with title rival Bagnaia briefly in second before Miller passed him.

Espargaro made contact with Brad Binder early in another exhilarating race, with Luca Marini sliding off into the gravel and Oliveira moving into second spot as the track dried out.

Marquez surged into fourth place as Quartararo continued to struggle, while Espargaro's title hopes suffered another blow when he was given a long-lap penalty for his clash with Binder.

Oliveira powered past Miller to take the lead 11 laps from the finish and there was no catching the Red Bull KTM rider, as he won for the first time since the second round of the season in Indonesia.

TOP 10

1. Miguel Oliveira (Red Bull KTM) 41:44.503
2. Jack Miller (Ducati) +0.703
3. Francesco Bagnaia (Ducati) +1.968
4. Johann Zarco (Pramac Racing) +2.490
5. Marc Marquez (Repsol Honda) +2.958
6. Enea Bastianini (Gresini) +13.257
7. Maverick Vinales (Aprilia) +14.566
8. Alex Marquez (LCR Honda) +14.861
9. Jorge Martin (Pramac Racing) +15.365
10. Brad Binder (Red Bull KTM) +18.097

CHAMPIONSHIP STANDINGS

Riders

1. Fabio Quartararo (Monster Energy Yamaha) 219
2. Francesco Bagnaia (Ducati) 217
3. Aleix Espargaro (Aprilia) 199
4. Enea Bastianini (Gresini) 180
5. Jack Miller (Ducati) 179

Teams

1. Ducati 398
2. Aprilia Racing 321
3. Red Bull KTM 285
4. Pramac Racing 278
5. Monster Energy Yamaha 250

Miguel Oliveira described his victory in Indonesia as an emotional rollercoaster as the Red Bull KTM rider triumphed in tricky conditions.

Oliveira finished more than two seconds clear of world champion Fabio Quartararo in a curtailed race at the Mandalika International Street Circuit, which started over an hour late due to torrential rain.

Quartararo qualified in pole position but was passed by Oliveira and Jack Miller, who held the early lead before the Portuguese made the most of superior pace.

The 27-year-old then navigated the wet track superbly to claim a fourth race win in MotoGP and back up his claims in the build-up that he can compete for the title.

"Emotionally, it was a rollercoaster," he said in parc ferme. "The start was perfect and in wet conditions, it is so difficult to find the limit.

"I followed Jack and knew I could be faster. I opened [a gap] and then it was a matter of managing it to the end.

"It hasn't been easy, the last few months haven't been easy for me. I promised my daughter I'd get a trophy in Indonesia – this one's for you.

"Let's go to Argentina, let's see what we can do, but now I'm really happy to be here."

Quartararo dropped to fifth before a supreme ride in the second half of the race saw him end a run of four consecutive non-podium finishes.

The Monster Energy Yamaha star felt the points could prove valuable come the business end of the season.

"I didn't expect it," he said. "Honestly, since the warm-up, I felt that we had something more than usual because we know that with wet conditions we always have more difficulties.

"When it's completely wet and with traction, I know my potential, but today I was better than I expected. I saw an opportunity and took it.

"These are super important points. It was my first podium with a full wet floor."

Fabio Quartararo was left baffled as to why his leather race suit split open as he slipped from pole position to a fourth-place finish at the Catalan Grand Prix.

MotoGP championship leader Quartararo was aiming to seal back-to-back wins in Barcelona following his triumph on the circuit in 2020, but the Monster Energy Yahama driver slipped up early on and failed to finish on the podium.

Miguel Oliveira got Red Bull KTM's first win of the season, and the third race victory of his career, with Johann Zarco and Jack Miller completing the top three.

Quartararo was second until the final three laps, when Zarco made a daring overtake and caught the Frenchman out.

To complicate matters, Quartararo's suit had opened, with the 22-year-old's chest protector also slipping out.

He cut two corners as he battled with Miller for third, and was handed a three second penalty which cost him a third straight podium position at the Catalan Grand Prix.

"What happened I don’t know, I just know that I had the leathers completely open," he explained to reporters.

"I tried to just put it in a normal position again, I couldn't do it. So was difficult to ride, but unfortunately, it happens.

"It happened today, so Alpinestars is looking at how it's possible because at the end of the race it was possible to close it again.

"But it's like this, it was not our day but I can be happy with this fourth position… well, third, but finishing fourth."

Former MotoGP champion Casey Stoner tweeted his thoughts on the incident, insisting Quartararo should have been disqualified from the race.

"Well, I think I already have a penalty that I don't agree [with], demoted three seconds from P3 to P4," Quartararo said when Stoner's comments were put to him.

"I think this penalty is quite enough. It's finished, the race is finished, everything is safe.

"So, I think right now it's not enough to talk anymore because the race is finished. I think there's no point to talk anymore about these possible things."

It was a race which belonged to Oliveira, with the Portuguese rider holding the lead for 23 laps.

"The most difficult thing about the race was the mental ability to stay calm, it was so easy to be aggressive or to just override the tires at the beginning," he said in a news conference.

"I felt like that was the key, stay calm and the race will come to me."

Elsewhere in a frantic race, six-time MotoGP champion Marc Marquez crashed out on Turn 10, which also claimed Valentino Rossi and Aleix Espargaro.

Marquez has now failed to finish the last three races, a career first for the 28-year-old.