Daniel Ricciardo topped the time sheets on day one at Barcelona while McLaren’s Fernando Alonso recovered from an early spin on lap six to finish with overall.
The Honey Badger set the quickest lap of the day in the morning session with a 1:20.179 and also completed the most laps with 103 which is over double the amount he managed last year.
Mercedes’ Valtteri Bottas was two hundredths of a second behind him with Ferrari’s Kimi Raikkonen third 80 laps done in the SF71H.
Reigning World Champion Lewis Hamilton could only manage a 1:22.327 in the afternoon session as he completed a mere 25 laps due to the adverse weather conditions.
Renault seemed to benefit most as Nico Hulkenberg claimed fourth and Carlos Sainz sixth in a step forward to challenging the top tier teams.
Fernando Alonso took a spin just six laps into the morning’s running but recovered to finish in fifth on a largely positive day for McLaren, particularly after the horrific pre-season they endured 12 months ago.
McLaren executive director Zak Brown dismissed the incident as nothing serious with a wheel nut issue as the root cause.
Toro Rosso, debuting new engine partner Honda, finished in eighth with Dylan Hartley completing the second-highest number of laps with 93.
Force India’s reserve driver Nikita Mazepin ran into the gravel at Turn 4 after a trip to the gravel morning session and did not complete any more laps.
Barcelona test one, day one time Sheet:
1) Ricciardo, Red Bull, 104 laps, Medium tyres – 1:20.179;
2) Bottas, Mercedes, 58 laps, Medium tyres – 1:20.349;
3) Raikkonen, Ferrari, 80 laps, Soft tyres – 1:20.506;
4) Hulkenberg, Renault, 73 laps, Medium tyres – 1:20.547;
5) Alonso, McLaren, 50 laps, Supersoft tyres – 1:21.339;
6) Sainz, Renault, 26 laps, Soft tyres – 1:22.168;
7) Hamilton, Mercedes, 25 laps, Medium tyres – 1:22.327;
8) Hartley, Toro Rosso, 93 laps, Soft tyres – 1:22.371;
9) Stroll, Williams, 46 laps, Soft tyres – 1:22.452;
10) Grosjean, Haas, 55 laps, Soft tyres – 1:22.578;
11) Ericsson, Sauber, 63 laps, Soft tyres – 1.23.408;
12) Mazepin, Force India, 22 laps, Medium tyres – 1:25.628;
13) Sirotkin, Williams, 27 laps, Soft tyres – 1:44.148.