Marc Marquez led an incident packed FP2 at the Czech Republic MotoGP, which included the reigning champion falling for the second time today.

Scorching afternoon conditions saw track temperatures hit 50 degrees (122 degrees F), contributing to a series of accidents and meaning ten riders failed to beat their morning lap time.

First to fall was Marquez's Repsol Honda team-mate Dani Pedrosa - fluid from his machine then reportedly causing MotoGP championship leader Valentino Rossi to suffer his first accident of the year.

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Rossi was unharmed, but forced to switch to his spare bike, while Pedrosa required ice on his left foot in the team truck and didn't return to the track. That prompted speculation of a possible fracture, but the Clinica Mobile subsequently declared Pedrosa to be 'OK'.

That was in the opening ten minutes, while the final ten minutes saw a spate of accidents as Andrea Dovizioso, Bradley Smith, Mike di Meglio and then Marquez all lost the front.

Although Marquez remained fastest, he was a fraction slower than Jorge Lorenzo's morning time. Lorenzo was just 0.076s behind Marquez for second place this afternoon, when most frontrunners made the transition from medium to hard compound tyres.

Ducati's Andrea Iannone joined Marquez as the only other rider in the top six to improve in the afternoon session, claiming third on a day when both the Italian and team-mate Andrea Dovizioso had one bike with a new engine and fairing.

Pedrosa's morning time put him fourth overall despite just two flying laps in FP2, while Rossi - who had just gone fastest when he fell - finished the afternoon in fourth (+0.561s), but sixth on combined times behind Dovizioso.

Rossi starts this weekend with a nine point lead over Lorenzo and 56-point lead over man-of-the-moment Marquez, who is chasing his third win in a row at a circuit where his perfect 2014 win streak finally ended.

Pol Espargaro was the next rider after Marquez and Iannone to improve in the afternoon, when he was fifth quickest and seventh overall. Team-mate Smith's morning time put the Englishman eighth, with Suzuki's Aleix Espargaro and LCR Honda's Cal Crutchlow completing the top ten courtesy of FP2 improvements.

1. Marc Marquez
2. Jorge Lorenzo
3. Andrea Iannone
4. Valentino Rossi
5. Pol Espargaro
6. Andrea Dovizioso
7. Aleix Espargaro
8. Cal Crutchlow
9. Bradley Smith
10. Yonny Hernandez
11. Danilo Petrucci
12. Maverick Vi?ales
13. Hector Barbera
14. Scott Redding
15. Stefan Bradl
16. Jack Miller
17. Dani Pedrosa
18. Loris Baz
19. Nicky Hayden
20. Alvaro Bautista
21. Eugene Laverty
22. Mike Di Meglio
23. Alex De Angelis
24. Claudio Corti
25. Karel Abraham