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:

01.United Kingdom Paul di RestaSahara Force India1:21.02010
02.United Kingdom Jenson ButtonVodafone McLaren Mercedes1:21.10820
03.France Romain GrosjeanLotus F11:21.25821
04.Spain Fernando AlonsoScuderia Ferrari1:21.30816
05.Finland Kimi RaikkonenLotus F11:21.60822
06.Australia Daniel RicciardoScuderia Toro Rosso1:22.06818
07.Deutschland Nico Rosberg Mercedes AMG Petronas1:22.40222
08.Mexico Sergio PerezVodafone McLaren Mercedes1:22.58717
09.Deutschland Sebastian VettelRed Bull Racing1:23.04726
10.Australia Mark WebberRed Bull Racing1:23.13116
11.Brazil Felipe MassaScuderia Ferrari1:23.34113
12.Finland Valtteri BottasWilliams F11:23.35217
13.France Jean-Eric VergneScuderia Toro Rosso1:23.38619
14.Deutschland Adrian SutilSahara Force India1:23.41719
15.Mexico Esteban GutiƩrrezSauber F11:23.95733
16.United Kingdom Lewis Hamilton Mercedes AMG Petronas1:25.05421
17.Deutschland Nico HulkenbergSauber F11:25.35422
18.Holland Giedo van der GardeCaterham F1 Team1:25.75321
19.United Kingdom Max ChiltonMarussia F11:25.82119
20.United States Alexander RossiCaterham F1 Team1:27.14320
21.Venezuela Pastor MaldonadoWilliams F11:27.52211
22.France Jules BianchiMarussia F11:29.3068