Lewis Hamilton on track during preseason testing.
Mercedes has been quietly impressive during the 2018 preseason.
Robert Kubica at the 2017 Hungarian in-season test.
Robert Kubica's solid performance at an in-season test has put him on the cusp of an unlikely comeback.
F1 prepares for record-breaking season
F1 in 2017 promises to deliver the fastest cars in the sport's history.
Testing delivers more question than answers ahead of 2017 season
Preseason testing has given us a taste of what could be an enthralling F1 season.
Who won the 'winter world championship'?
Five key points can be extracted from the data available from 2017 preseason testing.