Lewis Hamilton says a concerted effort to improve his qualifying performances have been a significant contributor to a stronger first half to the 2015 season than his 2014 title-winning effort.

Though it was Hamilton that would go on to clinch the 2014 Formula 1 drivers' crown with 11 race wins, he was comfortably out-performed by Nico Rosberg in terms of single lap pace on a Saturday, with the German starting 11 races from the top spot, compared with Hamilton's seven.

Indeed, though Hamilton felt he was at the top of his game last season, he identified qualifying as an area for growth. It is a focus that has yielded evident results in 2015 having clinched pole position in nine of the ten races so far.

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"There was a goal this season to improve on the last," he said. "I had a fantastic season last year and I came into this one thinking how will I improve.

"It is hard to improve and when you are at the top of your game it is not easy at all. Trying to find out how I can do that this year is something I've enjoyed.

"Qualifying has been an area which has been good, particularly Q3 which has given me the poles."

By contrast, Rosberg has aired his disappointment at the turning of tables between himself and his team-mate, but ultimately feels his race craft has at least improved.

"It is frustrating at the moment but I am nearly over it. It is not something that pulls me down but it is the way it is and as long as my racing is good I can try to turn it around."