Slowly but surely, teams will start to dig a bit deeper on the third day of pre-season testing at the Circuit de Catalunya.
Mercedes and Ferrari traded places at the top of the timesheets on first two days of the week, so it will be interesting to see who comes out on top on Wednesday.
Mercedes continues to split its days, with Valtteri Bottas kicking off the morning followed by Lewis Hamilton in the afternoon.
Sebastian Vettel relays Kimi Raikkonen for the entire day, while Daniel Ricciardo and Fernando Alonso will also be on deck, the latter desperately hoping for an incident-free day with McLaren.
Force India reserve driver Alfonso Celis Jr. will get a chance to help with the team's new car, while Carlos Sainz takes over from Dany Kvyat at Toro Rosso.
With Kevin Magnussen's work with Haas done for the week, Romain Grosjean takes over and not a minute too soon according to the Frenchman who is raring to go.
After yesterday's mishap involving rookie Lance Stroll, Williams has changed its schedule for today and will keep the Canadian in the FW40 to give him more track time.
Jolyon Palmer will remain on duty this morning for Renault before Nico Hulkenberg takes over this afternoon.
Finally, at Sauber, Marcus Ericsson will start off proceedings in the morning before passing the baton to impressive rookie Antonio Giovinazzi after lunch.
F1i will be live from Barcelona from 9:00am CET to provide live timing and commentary all day.
GALLERY: F1 drivers' wives and girlfriends
Keep up to date with all the F1 news via Facebook and Twitter
