Nick Kyrgios saved a match point as he overcame top seed Stefanos Tsitsipas to reach the final of the Citi Open in Washington.
The Australian notched up his fourth win against a top-10 player this year as he downed his Greek opponent 6-4 3-6 7-6 (7) in two hours and eight minutes.
Kyrgios got off to a flying start, breaking Tsitsipas in his second service game before clinching the opening set.
But the world No 6 remained undeterred and fought back to level up the match at one set all.
A closely-fought decider ended in a tiebreak, with Krygios firing a service winner to save a match point against him at 6-5 down before eventually triumphing on a second match point of his own.
The Australian will now face Daniil Medvedev, after the Russian ousted lucky loser Peter Gojowczyk.
Medvedev had a more straightforward semi-final clash, needing just 56 minutes to win 6-2 6-2.
The 23-year-old converted all five of his break-point opportunities and won 78 per cent of his first-serve points during the match.
Meanwhile, Dominic Thiem triumphed on his home soil as he won the Austria Open title in Kitzbuhel.
The world No 4 saved all six break points he faced to defeat Albert Ramos-Vinolas 7-6 (0) 6-1.
Diego Schwartzman claimed victory in the Los Cabos Open final in Mexico, winning 7-6 (6) 6-3 against Taylor Fritz.
The No 3 seed overcame his American opponent in an hour and 40 minutes to scoop his third career title.
