Alex de Minaur ran into an imperious Roger Federer as the home favourite collected a 10th Swiss Indoors Basel title of his career.
Stefanos Tsitsipas was no match for Roger Federer and a fierce St Jakobshalle crowd in the last four at the Swiss Indoors Basel.
Having won the Generali Open in Austria earlier this year, Dominic Thiem is now one match away from claiming another title on home soil.
Roger Federer will have to overcome world number seven Stefanos Tsitsipas in the semi-finals as he bids to defend his Swiss Indoors title.
Fernando Verdasco had won all four matches against Dominic Thiem but his dominance of the Austrian ended in Vienna on Thursday.
Roger Federer will not face the familiar foe of Stan Wawrinka as planned after the latter withdrew from the Swiss Indoor Basel.
Just 62 minutes were needed for Roger Federer to progress from his second-round clash with Radu Albot in Basel.
Taylor Fritz claimed the biggest win of his career by ranking, defeating the previously in-form Alexander Zverev.
Matteo Berrettini boosted his hopes of making the ATP Finals at the Erste Bank Open, where Grigor Dimitrov reached a milestone.
Having dropped just three games in his first-round win at the Swiss Indoors Basel, Roger Federer expressed delight at his fast start.