F1i brings you live coverage of the final day of the first in-season test from the Circuit de Catalunya in Barcelona.
Following Nico Rosberg's dominance of day one - and the Spanish Grand Prix weekend itself - Mercedes will have reserve driver Pascal Wehrlein in the car for the second day after he recovered from a fever which prevented him from driving for Force India on Tuesday.
Jenson Button is one of two race drivers taking part on the second day as he tests for McLaren and Carlos Sainz drives for Toro Rosso. The other nine 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.
Williams will have Alex Lynn in the FW37 for the first time on Wednesday, fresh from his victory in Sunday's GP2 sprint race, while fellow DAMS GP2 driver Pierre Gasly will drive for Red Bull having made his F1 debut for Toro Rosso on Tuesday.
Esteban Ocon drives for Force India following a late call-up due to Wehrlein's illness, with the 18-year-old Frenchman making his first appearance in the VJM08. Ocon made his F1 debut for Lotus at the end of last year but was not retained as part of the team's line-up, and Lotus will run reserve driver Jolyon Palmer on day two.
For live coverage of the second day of testing, click here