Alex de Minaur has beaten American Reilly Opelka in the Swiss Indoors semi-finals to set up a decider with top seed Roger Federer.
The Australian No.1 advanced to his fourth ATP final of the season after beating Opelka 7-6 (7-2) 6-7 (4-7) 7-6 (7-3) with break points in short supply in Basel on Saturday.
Both players dropped serve only once in a match that lasted more than two-and-a-half hours.
Despite Opelka firing 26 aces to De Minaur’s 14, it was the 20-year-old who prevailed in the tiebreaks to advance to his sixth ATP tour final and his fourth of the year, having already won titles in Sydney, Atlanta and Zhuhai.
In the other semi-final, Federer dispatched Greek third seed Stefanos Tsitsipas 6-4 6-4 in for his 50th win of the season.
Saturday’s victory a record 16th time that Federer had won 50 ATP tour games in a season and he has yet to drop a set at this year’s Basel tournament, where he has now won 23 consecutive matches over the years.
The 38-year-old will be looking to win his 10th title in his hometown when he faces the unseeded de Minaur in Sunday’s final — the 157th tour-level final of his career.
The Swiss former world number one did not drop serve – with high win percentages on his first (80 per cent) and second serve (85 per cent) – and he broke the 21-year-old Tsitsipas twice in the 78-minute contest.
Federer, who had 28 winners, was also a constant threat when he approached the net, winning nine of 10 net points in the opening set alone.