Serhou Guirassy scored as Borussia Dortmund boosted their slim top-four hopes with a 2-0 win at St Pauli on Saturday, while RB Leipzig's slide continued with a home loss to Mainz. Fresh from scoring four goals in a 6-0 demolition of Union Berlin last time out, Guirassy put Dortmund in front five minutes into the second half, tapping in a Karim Adeyemi pass. Adeyemi put Dortmund in the driver's seat with an excellent solo goal eight minutes later. The 23-year-old Adeyemi, one of the smallest players on the pitch, latched onto a long ball and used his strength to grapple past two defenders before slotting home.