Formula One frontrunners revving up to renew rivalries

MADRID - Formula One teams will finally take their 2018 cars to the track when preseason testing begins on Monday in Spain, with Mercedes and Ferrari promising significant improvements to try to keep running up front.

This week's test session in Barcelona will also allow McLaren to debut its Renault engine after three dismal years with Honda, and give Red Bull a chance to show it has a car fast enough to finally contest for titles again.

Force India and Williams will look to move closer to the top three, while Renault and Hass will try to keep improving. Toro Rosso will be the team trying to succeed with the Honda engine, while Sauber will bring partner Alfa Romeo back to F1, hoping to take a step forward after a last-place finish a year ago.