F1i brings you live coverage of the opening day of the second in-season test from the Red Bull Ring.
Following his dominance of the Austrian Grand Prix, Mercedes' Nico Rosberg will drive the W06 Hybrid for the first day.
Romain Grosjean is one of the other two race drivers taking part on the opening day as he tests for Lotus and Max Verstappen drives for Toro Rosso.
The other teams present are all running young drivers as part of the regulations which only allow race drivers to take part in two of the four days of in-season testing.
Ferrari Driver Academy member Antonio Fuoco will make his Formula One test debut in the SF15-T while fellow Maranello protégé Raffaele Marciello will run for Sauber in his role of official reserve driver.
Williams will have Susie Wolff back in the FW37 for the first time since last month's post-Spanish Grand Prix test. There is a similar situation at Red Bull where Pierre Gasly returns to the RB11, having already tested for the team and sister squad Toro Rosso in Barcelona.
Pascal Wehrlein once again drives for Force India as part of the Mercedes family, while McLaren-Honda will trust its test and development driver Stoffel Vandoorne to put the MP4-30 through its paces. The Belgian rising star is coming off another stellar GP2 weekend where he secured a fifth consecutive Feature Race win.
For live coverage of the opening day of testing, click here