MotoGP rookie Marc Marquez overtook title rivals Dani Pedrosa and Jorge Lorenzo to claim his fourth victory of the season at Indianapolis, extending his championship advantage.

Unbeaten throughout practice and qualifying, the 20-year-old lost out to his fellow front row starters into turn one, with Lorenzo taking the early advantage for Yamaha.

The trio soon broke clear of the field, with Marquez taking the runner-up spot from Repsol Honda team-mate Pedrosa on lap 8 of 27.

The reigning Moto2 champion then launched his victory pass at the halfway stage, drifting wide on the exit of the fast left-hand first turn sweep, then outbraking Lorenzo into the following tight right-hander.

The trio spent several more laps together, before Marquez's superior pace began to tell, his lead topping the one-second mark by lap 19. Marquez pulled away to complete a clean sweep of the three US based events, while Lorenzo and Pedrosa - who had both used the summer break to rebuild fitness from collarbone injuries - remained locked in battle.

Pedrosa reclaimed second position by overtaking Lorenzo at the start of the penultimate lap, quickly pulling a buffer over the #99.

Marquez won by 3.495s from Pedrosa, who was 2.2s ahead of Lorenzo.

Marquez has now won more races than any other rider this season, and finished on the rostrum in nine out of the ten rounds. The #93's title advantage stands at 21 points over Pedrosa, with reigning double champion Lorenzo 35 points behind.

The leading trio, like all the factory and satellite riders, opted for the harder front and softer rear tyre compounds.

A closer three-way contest decided fourth position on the final lap, with Valentino Rossi recovering from a season-worst ninth in qualifying to mount a late charge - catching and eventually passing both Cal Crutchlow (Tech 3 Yamaha) and Alvaro Bautista (Gresini Honda), who had battled for much of the race.

Stefan Bradl took a lonely seventh for Honda LCR, while another final turn showdown decided eighth, ninth and tenth: Nicky Hayden bumped past Ducati team-mate Andrea Dovizioso, sending them both over the kerb on the exit - allowing Tech 3 rookie Bradley Smith to blast by the Desmosedicis on the run to the line!

Smith had made an early impact on the race by blasting from seventh on the grid, to hold fourth behind the title fighters on lap one.

Andrea Iannone, still struggling with pain from a shoulder dislocation in July, brought the lone Pramac Ducati home in eleventh.

Luckless team-mate Ben Spies withdrew from what should have been his comeback event after dislocating his left shoulder in Saturday practice. Spies has struggled with right shoulder injuries since Malaysia last year, has not raced since round two in Texas.

Cardion AB's Karel Abraham also missed the race, pulling out after warm-up when it became clear that shoulder injuries suffered in a Friday practice fall would make lasting the race distance unlikely.

After the Laguna Seca 'blip', Aleix Espargaro returned to his usual position as top CRT, this time with a twelfth place finish for Aspar. Colin Edwards, starting a season best twelfth, finished 13th for Forward Racing with team-mate Claudio Corti and Avintia's Hiroshi Aoyama completing the scorers.

American Blake Young, making his third and final wild-card appearance of the year with Attack Performance Racing, fell just a few corners after the start.

The Czech Republic Grand Prix, the second of three back-to-back races, takes place at Brno next weekend.

Indianapolis MotoGP:
1. Marc Marquez
2. Dani Pedrosa
3. Jorge Lorenzo
4. Valentino Rossi
5. Cal Crutchlow
6. Alvaro Bautista
7. Stefan Bradl
8. Bradley Smith
9. Nicky Hayden
10. Andrea Dovizioso
11. Andrea Iannone
12. Aleix Espargaro
13. Colin Edwards
14. Claudio Corti
15. Hiroshi Aoyama
16. Hector Barbera
17.Danilo Petrucci
18. Michael Laverty
19. Bryan Staring

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