Carlos Sainz closed out Formula 1 free practice at the Spanish Grand Prix with the best time in FP3, ahead of Lando Norris by 0.03o seconds.
Sainz managed to beat Norris' soft-tyre benchmark in the final flurry of qualifying simulations, doing what the Mercedes duo and Ferrari team-mate Charles Leclerc could not.
A slow start to the session ensured that Lewis Hamilton had the circuit to himself in the opening five minutes, which he used to set the soft-tyre benchmark with a 1m14.178s - almost a second shy of his FP2 headliner.
He brought this down to a 1m13.865s shortly after Max Verstappen had set a 1m14.237s on mediums, but had to cede the advantage when George Russell punched in a 1m13.431s time to go fastest.
The two Mercedes were split by the Ferrari drivers; Sainz went up to second, just a tenth shy of Russell's lap, and Leclerc was a mere three-hundredths away from his team-mate after missing the bulk of FP2.
Norris then elbowed his way between Russell and the Ferraris on a lap with mediums, 0.001s clear of Sainz's previous lap. McLaren's preparation ahead of FP3 was almost derailed by a fire in its motorhome, but both drivers were able to take to the circuit with minimal loss in track time.
This early order-shuffling ended with a series of longer runs, ahead of a late-session tombola instigated by the final flying runs in preparation for qualifying.
Both McLaren drivers backed out of their initial flyers, Norris aborting his lap through Turn 7 and Piastri doing so before Turn 3, but Norris went again to claim a 1m13.043s on his next attempt.
Lewis Hamilton, Mercedes F1 W15
Photo by: Sam Bloxham / Motorsport Images
The Mercedes drivers found improvement and Hamilton clinched a purple middle sector, but a few snaps of oversteer cost him three tenths at the end of the lap. Russell, for his part, put in a time that was just 0.121s shy of Norris' effort.
Sainz overturned Norris' time, however, and punched in a 1m13.013s to put his Ferrari top. This looked set to be eclipsed by Charles Leclerc, but a slight wide moment at Turn 11 took some of the sting out of his lap and put him third - a mere 0.037s shy of Sainz's time.
Norris preserved second as there were no further improvements, although had a contretemps with Leclerc at the end of the session as the Monegasque cut across a slow Norris into Turn 6 and the two made contact, which will be investigated by the stewards.
Verstappen and Russell were fourth and fifth fastest, while sixth-placed Hamilton had his own contact at the end of the first sector with Lance Stroll.
Hamilton seemed to impede Stroll slightly and attempted to back out at Turn 5 to let the Aston through, but Stroll appeared to wash out mid-corner and took a swipe at the Mercedes driver, with the incident also under investigation.
Sergio Perez, who carries a grid penalty into qualifying, was seventh fastest, just 0.03s ahead of Williams' Alex Albon. Fernando Alonso and Piastri completed the top 10.
1'13.013
+0.030
1'13.043
+0.037
1'13.050
+0.074
1'13.087
+0.151
1'13.164
+0.346
1'13.359
+0.710
1'13.723
+0.740
1'13.753
+0.773
1'13.786
+0.894
1'13.907
+0.937
1'13.950
+0.951
1'13.964
+0.962
1'13.975
+1.011
1'14.024
+1.061
1'14.074
+1.148
1'14.161
+1.241
1'14.254
+1.407
1'14.420
+1.559
1'14.572
+1.716
1'14.729
Source: Autosport