Basel: Roger Federer extended his Swiss Indoors win streak to 23 matches as he beat Stefanos Tsitsipas 6-4, 6-4 on Saturday to reach the final for the 15th time, racking up his 50th win of 2019.
The top seed will be playing for his 10th title at his home tournament when he faces Alex de Minaur in a first-time meeting after the Australian stopped Reilly Opelka 7-6 (2), 6-7 (4), 7-6 (3) earlier.
Federer, 38, has now made the Basel final in his last 13 appearances and 15th overall. His last defeat came in the 2013 final at the hands of Juan Martin del Potro.
Australia's Alex de Minaur survived a barrage of 26 aces from American giant Reilly Opelka to battle to a 7-6 (2), 6-7 (4), 7-6 (3) win in the Swiss Indoors semi-finals on Saturday.
The 20-year-old, who trains and lives in Spain, will target his fourth title of 2019 on Sunday when he faces nine-time champion Roger Federer.
The world number 28 is the first Australian to reach the Basel final since Mark Philippoussis finished runner-up in 1997
De Minaur, who measures up at 1.80m compared to Opelka's towering 2.11m, set up victory with a passing winner for four match points.
Opelka saved the first with an ace but was caught out on the second as his opponent sealed the win.
"Nothing can prepare you for that serve," de Minaur said. "Reilly's an incredibly tough competitor who never gives up.
"I'm just happy to be in the final. I guessed right a few times and got lucky. I was just lucky to have gone the right direction, I was just hoping not be hit by any of those serves.
"I felt comfortable out there, my reflexes are better if I stand closer on return. You can't give him too many angles to work with."
De Minaur has won all three of his finals this season at Sydney, Atlanta and Zhuhai.