Valtteri Bottas topped the second Formula 1 free practice session for the Spanish Grand Prix, outpacing Mercedes team-mate Lewis Hamilton by 0.049 seconds.
Bottas, who also set the pace in the morning session, was fastest in the early stages when using medium-compound Pirellis, seven-tenths faster than Ferrari driver Sebastian Vettel.
Vettel and team-mate Charles Leclerc then traded top spot as the first frontrunners to use the soft Pirellis, with the latter eventually winning the intra-team battle with a lap 0.088s quicker than Vettel.
But at the halfway mark of the 90-minute session, Bottas and Hamilton were out and lapping quickly on the softs.
Hamilton initially took first place with a lap of 1m17.410s, only for Bottas to eclipse it with a 1m17.284s on his first flier on softs.
Although Hamilton subsequently improved, it was not by enough and he ended up just behind his team-mate and a quarter-of-a-second faster than the lead Ferrari of Leclerc.
Red Bull driver Max Verstappen, who suffered an oil leak in the first session that led to an engine change – with the spec 2 engine that was slated to be put in overnight anyway fitted – was fifth fastest and 0.750s down.
He subsequently complained of a loss of power that led to him returning to the pits after completing only 15 laps, although he did return to the track for the final 15 minutes of the session.
Romain Grosjean, driving the upgraded Haas, split the Red Bulls in sixth place after outpacing Pierre Gasly.
Kevin Magnussen was running in the old-spec Haas to allow the team to compare its revised package to the known one, and ended up eighth – two-tenths slower than Grosjean.
McLaren driver Carlos Sainz Jr pipped the Toro Rosso of Daniil Kvyat to ninth.
Alfa Romeo’s Kimi Raikkonen was one of the last drivers to improve during the session, allowing him to jump from 15th to 11th, putting him just ahead of the second Toro Rosso of Alex Albon.
Lance Stroll, who crashed his Racing Point machine at the ultra-fast Campsa right-hander in the morning and drove a car without the latest aero upgrades in FP2 as a result, was 13th fastest ahead of the Renaults of Nico Hulkenberg and Daniel Ricciardo.
Lando Norris was 16th, albeit only three tenths off the top 10, ahead of the second Alfa Romeo of Antonio Giovinazzi.
Sergio Perez was 18th in the Racing Point, ahead of Williams pair George Russell and Robert Kubica – the latter duo separated by six tenths.
|5||Max Verstappen||Red Bull/Honda||1m18.035s||0.751s||30|
|7||Pierre Gasly||Red Bull/Honda||1m18.238s||0.954s||34|
|9||Carlos Sainz Jr.||McLaren/Renault||1m18.658s||1.374s||45|
|10||Daniil Kvyat||Toro Rosso/Honda||1m18.722s||1.438s||40|
|11||Kimi Raikkonen||Alfa Romeo/Ferrari||1m18.727s||1.443s||30|
|12||Alexander Albon||Toro Rosso/Honda||1m18.779s||1.495s||44|
|13||Lance Stroll||Racing Point/Mercedes||1m18.839s||1.555s||33|
|17||Antonio Giovinazzi||Alfa Romeo/Ferrari||1m19.427s||2.143s||37|
|18||Sergio Perez||Racing Point/Mercedes||1m19.448s||2.164s||40|