Lewis Hamilton says he is "loving" F1's increased speed for the new season and has hailed Mercedes' faultless start to testing.
Sebastian Vettel has given a cautious thumbs-up to Ferrari's new car but says they aren't comparing themselves to Mercedes yet.
Mercedes and Ferrari stretched their legs on the third day of winter testing as F1 2017 began to deliver on its promise of faster cars.
Jolyon Palmer says F1's new-era cars are already in a different speed league through fast corners at Barcelona.
McLaren have laughed off speculation they are considering divorcing Honda and insisted they are "happy with their marriage".
Watch a special edition of Ted's Notebook as he sits down for an exclusive chat with new F1 managing director Ross Brawn.
Sky F1's Ted Kravitz summarises the action from Day Two at Barcelona, and reports on fast starts for Ferrari and Mercedes.
Mercedes' Valtteri Bottas has admitted he has found the process of switching teams a harder challenge than expected.
Daniel Ricciardo insists Red Bull can beat Mercedes in 2017, despite the rival teams' contrasting first two days of testing.
Kimi Raikkonen topped the timesheets on Day Two of testing at Barcelona from Lewis Hamilton despite running on slower tyres.
F1 2017's youngest driver, Lance Stroll, says his confidence will not be dented by the spin which ended his testing debut early.
Don't miss Ted's first Notebook of the season as the Sky F1 expert brings updates from all 10 teams from Test One.
Fernando Alonso has conceded McLaren's "disappointing" start to winter testing means they are already playing catch-up in 2017.
Lewis Hamilton is confident world champions Mercedes remain "the team to beat" in F1 2017 after topping Day One of testing.
Lewis Hamilton topped the timesheets as world champions Mercedes made an ominously fast start to F1 2017 on the first day of pre-season testing at Barcelona.
Red Bull's Christian Horner believes the reappearance of shark fin engine covers in F1 lets 2017's "fantastic" car designs down.
After 81 long days without Formula 1 we had 10 faster, meaner, cars back on track in Barcelona - don't miss the footage.
Ted Kravitz explains the purpose of the hole in Red Bull's nose, if it's legal, and whether it's a 2017 design 'must have'.
Catch up with the latest updates from F1 pre-season Testing at Barcelona as Sky Sports' Craig Slater and Ted Kravitz report.
Sauber's Pascal Wehrlein has confirmed he will miss the upcoming first pre-season test in Barcelona due to a back injury.