For more racing videos visit: www.f1zone.net Vodafone mclaren Mercedes launched their new challenger, the MP4-25, today at Newbury. The defending champions of 2008 had a dismal campaign in 2009, only winning two races in Hungary and Singapore respectively, unable to retain their titles. With a radical design, their fortunes are meant to turn around for 2010 – also bringing the reigning champion Jenson Button to the team alongside Lewis Hamilton definitely makes them more than just a contender for the upcoming year.