World number one Novak Djokovic and US Open champion Andy Murray have reached the last four at the ATP World Tour Finals in London after slicing through the various permutations of their round-robin group with matching wins.
A day that began with all four Group A players in contention for the top two spots ended without the need for calculators as Djokovic beat Czech Tomas Berdych 6-2 7-6 and Murray overcame Frenchman Jo-Wilfried Tsonga by the same score.
Djokovic finished the group stage with an unblemished record to top the standings although the make-up of the semi-finals will not be known until Group B concludes.
Swiss world number two Roger Federer is already assured of reaching the last four and will top the group and set up a clash with Murray if he beats Argentina's Juan Martin del Potro.
Djokovic will likely play either David Ferrer or del Potro.