BERLIN, Aug 19 (Reuters) - Hamburg maintained their perfect start to the Bundesliga season when a penalty from Rafael van der Vaart proved enough to give them a 1-0 win at home to Bayer Leverkusen on Sunday. Dutch midfielder Van der Vaart, who is trying to secure a move to Valencia before the transfer window closes, fired in the only goal in the 64th minute after a handball in the area. Hamburg's victory took them level on six points with leaders Bayern Munich -- the only other team with maximum points from two Bundesliga games. Bayern won 4-0 away to Werder Bremen on Saturday to underline their status as the overwhelming favourites for the Bundesliga title. Schalke 04 are in third place on four points after a 4-1 win at home to Borussia Dortmund in the big Ruhr Valley derby on Saturday. Champions VfB Stuttgart are down in 15th place with just a point from two games after they lost 3-1 at Hertha Berlin on Saturday.