Paul di Resta delivered a huge surprise in the opening practice session in Canada on Friday.

The session was characterized by continually changing track conditions. The morning Rain left the Gilles-Villeneuve Formula 1 Circuit wet enough for Pirelli’s intermediate tyres right up until the closing minutes.

Several drivers set the pace as the track evolved until right at the end. Force India driver was the quickest man after he switch to the medium slicks to post 1:21.020s on a great morning for Force India.

That move pushed Jenson Button, who earlier had lapped his improved McLaren in 1:21.511s on the same rubber. The Englishman’s response to the Scot was 1:21.108s, good enough for second but 0.088s adrift.

The top two drivers were followed by Lotus Romain Grosjean who lapped in 1:21.258s, while Fernando Alonso was fourth with 1:21.308s in front of Kimi Raikkonen with 1:21.608s.

Here are the full Canadian GP Practice 1 Results:

Pos. Drivers Teams Time Laps
01. United Kingdom Paul di Resta Sahara Force India 1:21.020 10
02. United Kingdom Jenson Button Vodafone McLaren Mercedes 1:21.108 20
03. France Romain Grosjean Lotus F1 1:21.258 21
04. Spain Fernando Alonso Scuderia Ferrari 1:21.308 16
05. Finland Kimi Raikkonen Lotus F1 1:21.608 22
06. Australia Daniel Ricciardo Scuderia Toro Rosso 1:22.068 18
07. Deutschland Nico Rosberg Mercedes AMG Petronas 1:22.402 22
08. Mexico Sergio Perez Vodafone McLaren Mercedes 1:22.587 17
09. Deutschland Sebastian Vettel Red Bull Racing 1:23.047 26
10. Australia Mark Webber Red Bull Racing 1:23.131 16
11. Brazil Felipe Massa Scuderia Ferrari 1:23.341 13
12. Finland Valtteri Bottas Williams F1 1:23.352 17
13. France Jean-Eric Vergne Scuderia Toro Rosso 1:23.386 19
14. Deutschland Adrian Sutil Sahara Force India 1:23.417 19
15. Mexico Esteban Gutiérrez Sauber F1 1:23.957 33
16. United Kingdom Lewis Hamilton Mercedes AMG Petronas 1:25.054 21
17. Deutschland Nico Hulkenberg Sauber F1 1:25.354 22
18. Holland Giedo van der Garde Caterham F1 Team 1:25.753 21
19. United Kingdom Max Chilton Marussia F1 1:25.821 19
20. United States Alexander Rossi Caterham F1 Team 1:27.143 20
21. Venezuela Pastor Maldonado Williams F1 1:27.522 11
22. France Jules Bianchi Marussia F1 1:29.306 8