Schalke have moved third in Die Bundesliga following a 2-0 win over Eintracht Frankfurt.
Werder Bremen crashed to Hertha Berlin on Saturday, opening the door for Schalke just 24 hours later.
Schalke made no mistake with their game in hand although the Arena AufSchalke clash remained scoreless at the break.
Home supporters' nerves were settled shortly after the restart when Soren Larsen broke the deadlock after 52 minutes.
Frankfurt battled bravely but their hopes of a point were extinguished in injury time when Ebbe Sand added a crucial second.
Hamburg have closed to within six points of leaders Bayern Munich after beating lowly Kaiserslautern 3-0.
The Red Devils gave a good account of themselves at the AOL - Arena before being undone by a quick-fire brace.
Benjamin Lauth broke the deadlock after 55 minutes with an own goal from Fabian Schonheim minutes later effectively settling the contest.
Dutch ace Rafael van der Vaart placed the icing on the cake late on when he found the back of the net from the penalty spot.