( CNN ) -- Triple world champion Sebastian Vettel led a Red Bull one-two in practice for the Hungarian Grand Prix Friday as Mercedes struggled with new tires and the blistering heat in Budapest . Vettel was fastest on Pirelli 's soft offering in the morning and repeated the trick in the afternoon on mediums with teammate Mark Webber just behind . Mercedes pair Lewis Hamilton and Nico Rosberg have dominated practice and qualifying in recent races , but were off the pace this time in sixth and seventh place respectively in the afternoon runs . The team had been excluded from last week 's tire testing at Silverstone and have catching up to do admitted Rosberg . `` We know it 's quite challenging for our car in these hot conditions , '' he told the official F1 website . `` Some of the other teams look quick here , so we have more work to do , '' added the German . Hamilton , a three-time winner at Hungaroring , was more upbeat . `` We can generally pull out a bit more in qualifying so let 's see how tomorrow goes . '' Vettel is seeking his first win in Hungary to follow a maiden triumph in Germany in the previous round and all the omens look good for the German star . `` It 's nice when you feel in control of the car and you can play around . I think the car suits the track . `` There is still a bit of work to do , but we need to make sure we get everything out of the car tomorrow , '' he added . Webber , who will retire at the end of the season , was just 0.044 seconds adrift of his teammate with Romain Grosjean third fastest for Lotus . Two-time champion Fernando Alonso and his Ferrari teammate Felipe Massa , who sustained life threatening head injuries in a freak accident at the circuit in 2009 , were fourth and fifth quickest . Kimi Raikkonen made contact with the McLaren of fellow ex-world champion Jenson Button during the session and finished eighth fastest . Button finished just behind him , a boost for his struggling team with the Force Indias of Adrian Sutil , taking part in his 100th grand prix , and Paul di Resta next . Saturday will see final qualifying with track temperatures expected to remain over 40 degrees Celsuis for Sunday 's race proper .
Mercedes in both practice sessions for Germany GP . Tops Friday 's morning and 0.044 seconds runs in his Red Bull . Teammate Mark Webber second fastest . Sebastian Vettel fastest pair Lewis Hamilton and Lewis Hamilton off the pace .