Jannik Sinner beat Holger Rune to maintain his perfect start at the ATP Finals - and help send Novak Djokovic into the last four in Turin.
World number one Djokovic, who beat Hubert Hurkacz 7-6 (7-1) 4-6 6-1 earlier on Thursday, needed a Sinner victory to advance to the semi-finals.
The Italian, who won 6-2 5-7 6-4, tops the group with three wins from three.
Djokovic, who is chasing a record seventh ATP Finals title, finished second in the round-robin group stage.
Fourth seed Sinner, 22, took on Rune knowing he was guaranteed at least a second-place finish in the Green Group and a spot in the semi-finals.