Daniil Medvedev came from a set down to beat Rafael Nadal 3-6, 7-6 (7/4), 6-3 in London on Saturday to set up a title match at the ATP Finals against Dominic Thiem. The Spanish second seed, who has never won the season-ending event, served for the match in the second set but the Russian fourth seed broke back. Medvedev broke twice in the decider to seal the match. jw/dj