Carlos Sainz Jr. celebrated his call-up by Red Bullfor the upcoming Formula 1 young driver test by topping the GP3 practice times at Silverstone.
The Spaniard lapped in 1m47.432s in a session that began in wet conditions but quickly dried out. His MW Arden car was 0.439 seconds clear of Bamboo's Lewis Williamson. Nick Yelloly was a last-lap improver to end the session third fastest for Carlin, ahead of Daniil Kvyat.
Valencia winner Conor Daly was fifth quickest, ahead of Melville McKee. Points leader Tio Ellinas was seventh fastest, surviving a huge spin on the exit of Luffield.
Dino Zamparelli was eighth fastest, with fellow Brit Jack Harvey slipping back to 11th after setting the pace in the middle of the session.
Pos Driver Team Time Gap
1. Carlos Sainz Jr Arden 1m47.432s
2. Lewis Williamson Bamboo 1m47.871s +0.439s
3. Nick Yelloly Carlin 1m47.877s +0.445s
4. Daniil Kvyat Arden 1m48.113s +0.681s
5. Conor Daly ART 1m48.187s +0.755s
6. Melville McKee Bamboo 1m48.303s +0.871s
7. Tio Ellinas Manor 1m48.307s +0.875s
8. Dino Zamparelli Manor 1m48.686s +1.254s
9. Alex Fontana Jenzer 1m48.815s +1.383s
10. Facu Regalia ART 1m48.879s +1.447s
11. Jack Harvey ART 1m48.884s +1.452s
12. Luis Sa Silva Carlin 1m48.887s +1.455s
13. Giovanni Venturini Trident 1m48.924s +1.492s
14. Patrick Kujala Koiranen 1m49.045s +1.613s
15. Adderly Fong Status 1m49.250s +1.818s
16. Robert Visoiu Arden 1m49.389s +1.957s
17. Josh Webster Status 1m49.547s +2.115s
18. Jimmy Eriksson Status 1m49.791s +2.359s
19. Eric Lichtenstein Carlin 1m50.265s +2.833s
20. Kevin Korjus Koiranen 1m50.272s +2.840s
21. Aaro Vainio Koiranen 1m50.426s +2.994s
22. David Fumanelli Trident 1m50.805s +3.373s
23. Patric Niederhauser Jenzer 1m51.314s +3.882s
24. Emanuele Zonzini Trident 1m51.675s +4.243s
25. Ryan Cullen Manor 1m52.878s +5.446s
26. Samin Gomez Jenzer 1m53.051s +5.619s
27. Carmen Jorda Bamboo 1m56.136s +8.704s