Lewis Hamilton has admitted that he has "a lot of work to do" after being forced to retire for the second time this season at the Canadian Grand Prix.

Both he and fellow Mercedes driver, Nico Rosberg, had technical problems during the race, with Hamilton being forced to retire due to brake failure on lap 49.

Rosberg continued with the advantage of knowing what happened to his team-mates car, and following instructions from his technical team, drove more cautiously and was able to nurse his car home into second place, picking up 18 points in the process. Those points mean that he now leads his team-mate by 22 points in the Drivers Championship, and Hamilton will, for the second time this season,  need to come back from a frustrating retirement.

"Well I've had a lot of work to do since race one - that is now two DNF's that I have had and zero for Nico. We will keep pushing and hopefully comeback stronger in the next race," the British driver told Sky Sports after the race.

"I was in the lead at the time that it failed. I am two DNFs down - so that is 50 points, or almost 50 points that I have lost so I am going to have to try and recover them somewhere else."

Mercedes confirmed via Twitter that "high-voltage control electronics failure lead to permanent loss of MGU-K drive on both cars in today's race", but Hamilton feels that running behind Rosberg for the majority of the race caused his problems to be worse than the Germans.

"The thing is I was following him and when you are following someone you are getting more heat - he was in clean air the whole time in front and so there was not really much I could do. When I finally came out in front I think by then everything was already cooked so there was nothing I could do. It was an unfortunate day, but the team still go 18 points which is good, so we will move on and hope we don't have any more DNFs throughout the year."

The Drivers-Championship leader, Rosberg, had a relieved look on his face at the end of the race and said “It was a big battle all the way. I lost a lot of power and was slow down the straights. I had problems with ERS. We had some reliability problems today”

The retirement is a cruel blow to Hamilton, especially on a track where he has enjoyed so much success, winning three times since his debut in 2007. He will need to put in several more sterling performances if he is to get back into the title race this season, and possibly hope that Rosberg ends a race or two with a DNF beside his name.

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