Sports

Internal battle at Mercedes between Hamilton and Rosberg set to provide intrigue all season

Mercedes driver Lewis Hamilton of Britain   steers his car during the second free practice at the Monaco racetrack, in Monaco, Thursday, May 22, 2013. The  Monaco Formula One Grand Prix will be held on Sunday. (AP Photo/Claude Paris)

Mercedes driver Lewis Hamilton of Britain steers his car during the second free practice at the Monaco racetrack, in Monaco, Thursday, May 22, 2013. The Monaco Formula One Grand Prix will be held on Sunday. (AP Photo/Claude Paris)  (The Associated Press)

With Mercedes looking certain to run away with the Formula One constructors' championship, the promising battle between Lewis Hamilton and Nico Rosberg should provide an intriguing backdrop for the rest of the season.

Rosberg is only three points behind Hamilton, the championship leader, who has won the past four races. The two go back a long way, to their days karting together. But with so little separating them in the title race, their friendship looks set to be tested.