(CNN) -- Defender Marcell Jansen scored twice as 10-man Hamburg went top of the Bundesliga table with a battling 2-1 victory at Bayer Leverkusen on Sunday.
Hamburg celebrate Marcell Jansen's winning goal as they moved two points clear at the top of the Bundesliga.
The German international put the visitors ahead in the 11th minute with a superb strike from the edge of the area that gave Rene Adler no chance in the Leverkusen goal.
Patrick Helmes scored his third goal in two games in the 29th minute to bring the home side level, but Jansen secured the points when he volleyed home a 66th-minute winner from Jose Paolo Guerrero's header.
Hamburg had defender Jerome Boateng sent off for two yellow cards in quick succession four minutes from time, but Leverkusen could not make their man advantage count.
The result means Hamburg now lead Hoffenheim by two points with Hertha Berlin third on goal difference. Champions Bayern Munich are fourth -- four points behind Hamburg -- with Leverkusen and Wolfsburg fifth and sixth, just six points off the pace in the closest Bundesliga title race in years.
Hoffenheim had led the table for 24 hours after they were held to a 3-3 draw at Stuttgart on Saturday while Bayern slumped 2-1 at home to Cologne, their third defeat in four league games.