Enea Bastianini toasted his Grand Prix of the Americas victory by treating himself to some burgers and said he is hungry to keep hold of top spot in the championship.

The Gresini rider passed Ducati's Jack Miller with five laps remaining at the Circuit of the Americas in Texas to record his second win in four races this season.

Bastianini finished 2.058 seconds ahead of closest challenger Alex Rins, who also overtook third-placed Miller, as the Italian added to his maiden MotoGP triumph in Qatar.

"It's a fantastic day," Bastianini said. "Miller had fantastic pace in the first part of the race, then I felt like I had to push, I accelerated like crazy and I won.

"Winning here in America is fantastic. Now we eat some burgers!"

Bastianini leads the riders' standings with four of the 21 races completed, sitting five points better off than Suzuki Ecstar rider Rins and 11 clear of Aleix Espargaro of Aprilia.

And the 24-year-old is beginning to believe that an unpredictable 2022, in which 10 riders have finished on the podium over the first four races, could be a memorable one.

"It's possible," Bastianini said when asked if he can retain top spot. "This is better than the Qatar win because we know we are consistent and every race we are on the front.

"We will see if we can repeat this result in the future. In European races I think the gap will be closer again."

Bastianini is just the third winner in the nine-year history of the race, with Marc Marquez having prevailed on seven previous occasions and Rins once, in 2019.

Marquez recovered from a poor start on Sunday to climb from 17th to sixth, while Joan Mir and Francesco Bagnaia rounded out the top five.

While Marquez climbed the standings late on, Miller fell from first to third in a race that he led for 15 of the 20 laps.

Rather than feeling too downbeat, though, the Australian simply congratulated Bastianini and Rins for finishing stronger.

"I have mixed feelings," he said. "I had a fantastic race. Enea passed me but I didn't make any mistakes.

"This championship is so long, anything can happen. It's wide open."