Reserve Alfa Romeo driver Robert Kubica was fastest as Formula One preseason testing resumed Wednesday at the Barcelona-Catalunya Circuit.

Kubica had a time of 1 minute, 16.942 seconds, becoming the first driver other than Mercedes teammates Lewis Hamilton and Valtteri Bottas to go faster than 1:17.000 this year.

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Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Reserve Alfa Romeo driver Robert Kubica was fastest as Formula One preseason testing resumed Wednesday at the Barcelona-Catalunya Circuit.

Carlos Sainz steers his McLaren during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Mercedes continued to show good reliability, with Hamilton's 88 laps being the most among all 10 drivers who went to the track in the morning. The defending champion was fourth-fastest.

Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Kubica also spun out early in the morning session.

Lewis Hamilton steers his Mercedes during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Some teams on Wednesday tested the prototype Pirelli tire which was being developed specifically for the banked corners that drivers will encounter at the Zandvoort track that will host the return of the Dutch Grand Prix in May.

Lewis Hamilton drives his Mercedes during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

The Barcelona-Catalunya track will host the Spanish GP on May 10.

Romain Grosjean drives his Hass during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Romain Grosjean drives his Hass during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Renault driver Daniel Ricciardo drives his car during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Renault driver Daniel Ricciardo drives his car during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Alfa Romeo driver Kimi Raikkonen had led one of the tests sessions last week.

Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Mercedes continued to show good reliability, with Hamilton's 88 laps being the most among all 10 drivers who went to the track in the morning. The defending champion was fourth-fastest.

Pierre Gasly of AlphaTauri was second, nearly six tenths of a second slower than Kubica, with Red Bull driver Alexander Albon finishing third.

Ferrari driver Sebastian Vettel was sixth, but he ran 84 laps in the morning. He caused the first red flag of the day, though, after running wide and losing the rear of his car.

Carlos Sainz steers his McLaren during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Carlos Sainz steers his McLaren during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Kubica also spun out early in the morning session.

Mercedes was dominant in the first week, setting the fastest times and running the most laps — 494. Bottas led the time charts with a lap of 1:15.732 seconds.

Mercedes also attracted attention last week by introducing a novel steering system in which drivers pull the steering wheel back and forth to adjust the angle of the front wheels on straights.

Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Some teams on Wednesday tested the prototype Pirelli tire which was being developed specifically for the banked corners that drivers will encounter at the Zandvoort track that will host the return of the Dutch Grand Prix in May.

The season begins with the Australian GP in Melbourne on March 15. It is the last before new regulations are put into place in 2021 to try to provide a more level playing field.

Preseason testing has been reduced from eight to six days to help compensate for the record 22 races on the calendar, including a new Vietnam GP and the Dutch GP. Midseason testing also has been eliminated.

Lewis Hamilton steers his Mercedes during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Lewis Hamilton steers his Mercedes during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

The Barcelona-Catalunya track will host the Spanish GP on May 10.

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Lewis Hamilton drives his Mercedes during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Lewis Hamilton drives his Mercedes during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Romain Grosjean drives his Hass during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Romain Grosjean drives his Hass during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Sebastian Vettel steers his Ferrari during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Renault driver Daniel Ricciardo drives his car during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)

Renault driver Daniel Ricciardo drives his car during the Formula One pre-season testing session at the Barcelona Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, Feb. 26, 2020. (AP PhotoJoan Monfort)