Britain's Jamie Murray reached the doubles semi-finals of the ATP Finals in London for a third successive year.
The Scot and Brazilian partner Bruno Soares beat Colombia's Juan-Sebastian Cabal and Robert Farah 6-4 6-3.
Breaks in the 10th game of the first set and fourth game of the second proved decisive as the fourth seeds sealed victory in one hour 13 minutes.
Murray served out the match, sealing victory when Cabal sent a forehand into the net.
The pair had also won a tight opening match against Raven Klaasen and Michael Venus on Sunday, meaning they make sure of progressing with a match to spare.