Sloane Stephens produced a fine comeback to book her place in the final of the WTA Finals with a three-set victory over Karolina Pliskova.

The 2017 US Open champion went into the encounter in superb form, having won all of her group matches en route to the last four in Singapore.

However, she appeared bewilderingly short of her best as she was roughed up in the first set, Pliskova taking the first eight games of the match without reply.

The tide then turned in Stephens favour as she later won six of the next eight games to push the match to a third set, before dominating the decider to prevail love-6, 6-4 6-1 and book a final meeting with Elina Svitolina.