Why is Lewis Hamilton so upbeat as second half of F1 year kicks off?

Lewis Hamilton is in an upbeat mood as F1 action resumes in Spa this weekend, and the Briton says that he wants to put the "difficult times" of the first half of the season behind him.

Lewis Hamilton has had an up and down year for Mercedes.

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Lewis Hamilton is in an upbeat mood as F1 action resumes in Spa this weekend, and the Briton says that he wants to put the "difficult times" of the first half of the season behind him.

"The summer break was a good chance to relax and to reflect on what's been an incredible start to the year for us as a team," said Hamilton. "But personally, I can't wait to get back in the car and back into the battle for the championship. I had some difficult weekends in the first part of the season, but then a bit of good fortune at the last race in Budapest kept me from damaging my car on the wall during that first lap, so hopefully that was a sign that my fortunes are changing at just the right time.

"There were so many positives to take from the opening 11 races, but both myself and the team always want more, and know we are capable of more. The aim is to put the more difficult times of some of the previous weekends behind us and to recreate the best moments at every race from now on."

Meanwhile, Mercedes teammate Nico Rosberg says he's taking nothing for granted, despite the team's form in the first half of the year.

"It's good to be back after the break and to see everyone looking really refreshed and up for the fight in the remaining months of the season," said the German. "The last race didn't turn out how I had hoped after taking pole in tricky conditions the day before, but I still managed to come away with my championship lead intact, and that's a good place to be heading into the next part of the year.

"Although we have had a great start with plenty of good results, that race showed that the other teams are never too far away. In Formula One you just can't afford to give away any advantage and I know that both the team and myself will be working harder than ever to keep improving and maintain our position right to the very end. On top of that, the battle with Lewis has been so close all season -- and it could well stay that way right up to the final race -- so every last point will be crucial in that contest, too."