Jorge Lorenzo yang tidak bisa meraih hasil maksimal pada tiga sesi latihan sebelumnya kali ini memimpin pada awal sesi dengan 1 menit 39,506 detik.
Hingga sesi tersisa 10 menit, Lorenzo masih bertahan sebagai yang tercepat. Hingga akhirnya Marquez mencatat watu lebih baik, 1 menit 39.265 detik.
Hingga sesi 30 menit ini berakhir, Marquez bertahan sebagai yang tercepat. Cal Crutchlow kembali menempel sebagai tercepat kedua.
Para pebalap langsung bersiap menjalani sesi kualifikasi untuk menentukan posisi start saat balapan.
Berikut hasil sesi latihan bebas keempat GP Argentina.
1. Marc Marquez ESP Repsol Honda Team (RC213V) 1m 39.265s [Lap 8/14] 328km/h (Top Speed)
2. Cal Crutchlow GBR CWM LCR Honda (RC213V) 1m 39.444s +0.179s [10/15] 323km/h
3. Jorge Lorenzo ESP Movistar Yamaha MotoGP (YZR-M1) 1m 39.506s +0.241s [3/15] 322km/h
4. Andrea Dovizioso ITA Ducati Team (Desmosedici GP15) 1m 39.614s +0.349s [3/14] 324km/h
5. Valentino Rossi ITA Movistar Yamaha MotoGP (YZR-M1) 1m 39.666s +0.401s [15/15] 322km/h
6. Yonny Hernandez COL Pramac Racing (Desmosedici GP14.2) 1m 39.918s +0.653s [10/11] 325km/h
7. Andrea Iannone ITA Ducati Team (Desmosedici GP15) 1m 39.963s +0.698s [12/13] 325km/h
8. Scott Redding GBR Estrella Galicia 0,0 Marc VDS (RC213V) 1m 40.006s +0.741s [13/13] 322km/h
9. Pol Espargaro ESP Monster Yamaha Tech 3 (YZR-M1) 1m 40.047s +0.782s [4/16] 325km/h
10. Aleix Espargaro ESP Team Suzuki Ecstar (GSX-RR) 1m 40.080s +0.815s [3/13] 315km/h
11. Maverick Viñales ESP Team Suzuki Ecstar (GSX-RR)* 1m 40.225s +0.960s [2/12] 313km/h
12. Bradley Smith GBR Monster Yamaha Tech 3 (YZR-M1) 1m 40.394s +1.129s [14/16] 325km/h
13. Eugene Laverty IRL Aspar MotoGP Team (RC213V-RS)* 1m 40.451s +1.186s [3/15] 316km/h
14. Hector Barbera ESP Avintia Racing (Desmosedici GP14 Open) 1m 40.576s +1.311s [3/9] 327km/h
15. Danilo Petrucci ITA Pramac Racing (Desmosedici GP14.1) 1m 40.601s +1.336s [2/11] 323km/h
16. Nicky Hayden USA Aspar MotoGP Team (RC213V-RS) 1m 40.672s +1.407s [11/13] 314km/h
17. Alvaro Bautista ESP Factory Aprilia Gresini (RS-GP) 1m 40.727s +1.462s [7/13] 313km/h
18. Stefan Bradl GER Athina Forward Racing (Forward Yamaha) 1m 40.738s +1.473s [13/14] 322km/h
19. Loris Baz FRA Athina Forward Racing (Forward Yamaha)* 1m 40.819s +1.554s [13/14] 317km/h
20. Jack Miller AUS CWM LCR Honda (RC213V-RS)* 1m 40.860s +1.595s [11/14] 319km/h
21. Hiroshi Aoyama JPN Repsol Honda Team (RC213V) 1m 40.862s +1.597s [3/14] 325km/h
22. Alex De Angelis RSM Octo IodaRacing (ART) 1m 41.083s +1.818s [3/13] 312km/h
23. Karel Abraham CZE Cardion AB Motoracing (RC213V-RS) 1m 41.105s +1.840s [4/11] 315km/h
24. Mike Di Meglio FRA Avintia Racing (Desmosedici GP14 Open) 1m 41.121s +1.856s [9/11] 324km/h
25. Marco Melandri ITA Factory Aprilia Gresini (RS-GP) 1m 41.125s +1.860s [8/11] 314km/h
Fastest Practice Time:
Marc Marquez SPA Honda 1m 38.602s (FP3)
Official Argentina MotoGP records:
Best lap:
Marc Marquez SPA Honda 1m 37.683s (2014)
Fastest race lap:
Dani Pedrosa SPA Honda 1m 39.233s (2014)