Mercedes has been quietly impressive during the 2018 preseason.
Robert Kubica's solid performance at an in-season test has put him on the cusp of an unlikely comeback.
F1 in 2017 promises to deliver the fastest cars in the sport's history.
Preseason testing has given us a taste of what could be an enthralling F1 season.
Five key points can be extracted from the data available from 2017 preseason testing.