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.
Red Bull may not be able to challenge Mercedes until halfway through the 2017 season, according to Helmut Marko.
Jolyon Palmer says F1's new-era cars are already in a different speed league through fast corners at Barcelona.
Read all about it: A rundown of the quickest times set in pre-season action at Barcelona per driver, team and tyre...
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.
Valtteri Bottas sets quickest time of the week but Sebastian Vettel not far off pace, while Lance Stroll crashes his Williams.
New F1 chief Ross Brawn has told Sky Sports he 'dreams' of staging a non-championship race in F1 to experiment with new formats.
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.
From first-class football, to international cricket and a big boxing showdown, there's a jam-packed bill of great sport coming up on Sky Sports this week.
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.