Scotland 18 Wales 28: Defending champions Wales ground out a 10-point win over Scotland at Murrayfield in the penultimate round to keep their title hopes alive.
The victory was a record fifth away win in the tournament for the 2012 grand slam champions, who lost their opening match to Ireland.
They now face a potential title-decider at the Millennium stadium next Saturday against unbeaten England, who host Italy at Twickenham on Sunday.
Wales hooker Richard Hibbard scored the only try of a scrappy match, dominated by the Welsh forwards. Fullback Leigh Halfpenny kicked a conversion and seven penalties.
Scotland scrumhalf Greig Laidlaw, the hero of the home victory over Ireland in the previous round, converted six penalties.