Rookie title leader Marc Marquez topped the timesheets for the third session in a row, while Stefan Bradl continued his promising US GP form with second place.
Cal Crutchlow - quickest in FP1 - was visibly angry after a sizeable fall at Turn 3 with twelve minutes remaining, which sent his Yamaha bouncing through the gravel trap.
After again opting to sit out the morning session, Dani Pedrosa rode his first Saturday laps in FP4.
Qualifying 1, for those outside the top ten after third free practice, including Pedrosa, will now get underway. Fellow injured title contender Jorge Lorenzo has already claimed his place in Q2.
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1. Marc Marquez ESP Repsol Honda Team (RC213V) 1m 21.680s 2. Stefan Bradl GER LCR Honda MotoGP (RC213V) 1m 21.890s 3. Cal Crutchlow GBR Monster Yamaha Tech 3 (YZR-M1) 1m 21.949s 4. Alvaro Bautista ESP Go&Fun Honda Gresini (RC213V) 1m 22.105s 5. Dani Pedrosa ESP Repsol Honda Team (RC213V) 1m 22.182s 6. Jorge Lorenzo ESP Yamaha Factory Racing (YZR-M1) 1m 22.221s 7. Valentino Rossi ITA Yamaha Factory Racing (YZR-M1) 1m 22.362s 8. Andrea Dovizioso ITA Ducati Team (GP13) 1m 22.381s 9. Bradley Smith GBR Monster Yamaha Tech 3 (YZR-M1) 1m 22.796s 10. Nicky Hayden USA Ducati Team (GP13) 1m 23.008s 11. Randy De Puniet FRA Power Electronics Aspar (ART CRT) 1m 23.241s 12. Hector Barbera ESP Avintia Blusens (FTR-Kawasaki CRT)* 1m 23.358s 13. Aleix Espargaro ESP Power Electronics Aspar (ART CRT) 1m 23.394s 14. Claudio Corti ITA NGM Forward Racing (FTR-Kawasaki CRT)* 1m 23.509s 15. Alex De Angelis RSM Ignite Pramac Racing (GP13) 1m 23.625s 16. Karel Abraham CZE Cardion AB Motoracing (ART CRT) 1m 24.020s 17. Danilo Petrucci ITA Came IodaRacing Project (Suter-BMW CRT)* 1m 24.226s 18. Colin Edwards USA NGM Forward Racing (FTR-Kawasaki CRT)* 1m 24.306s 19. Hiroshi Aoyama JPN Avintia Blusens (FTR-Kawasaki CRT)* 1m 24.373s 20. Yonny Hernandez COL Paul Bird Motorsport (ART CRT) 1m 24.729s 21. Michael Laverty GBR Paul Bird Motorsport (PBM-ART CRT)* 1m 24.779s 22. Bryan Staring AUS Go&Fun Honda Gresini (FTR-Honda CRT) 1m 25.260s 23. Lukas Pesek CZE Came IodaRacing Project (Suter-BMW CRT)* 1m 25.610s * Standard ECU.
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