ATP World Tour Finals: Stan Wawrinka downs Marin Cilic to make semis

London: Switzerland`s Stan Wawrinka booked his place in the semi-finals of the ATP Tour Finals with a 6-3, 4-6, 6-3 victory over US Open champion Marin Cilic on Friday.

The complex formula used to determine the group standings meant the world number four knew that he only needed to win three games against Cilic to be guaranteed to finish as Group A runner-up.

Australian Open champion Wawrinka, who also made the last four at London`s O2 Arena last year, wasted little time taking three of the first four games and eventually clinched his second win of the tournament to secure a clash with compatriot Roger Federer in Saturday`s semi-finals.