Alex de Minaur recovered from "a dark place" to keep alive his hopes of progressing at the ATP Finals, while confirming Carlos Alcaraz's place in the knockout stages in Turin.
Requiring a straight-set victory to remain in contention, Australia's De Minaur ended American sixth seed Taylor Fritz's tournament with an impressive 7-6 (7-3) 6-3 win.
Spain's Alcaraz faces Lorenzo Musetti in the final match in the Jimmy Connors Group later on Thursday, when Italian Musetti will seek to deny De Minaur qualification for the semi-finals.
Although already qualified, Alcaraz will be highly motivated to achieve a third consecutive win - not only to top the group, but to also guarantee the year-end world number one ranking.