18:00 CET - Good evening and welcome to our coverage of the men's semi-finals at the US Open, with a massive opportunity for all four players at the final Grand Slam of the year.
The first clash gets underway in three hours, as top seed and Roland Garros champion Alexander Zverev takes on 2022 semi-finalist Karen Khachanov.
After playing exclusively in the night session during the tournament, Zverev will take to the court earlier for the first time, but hasn't yet reached the heights that saw him win his maiden Grand Slam title and reach the Wimbledon final.
He has battled his way through to the last four, but his experience and prowess in five-set tennis stand him in good stead amongst three other players who have never reached a Slam final before.
Unseeded Khachanov will provide Zverev with his toughest test, however. A player who has struggled for his best form this season, the Russian has played some rock-solid tennis during this event to reach a third Grand Slam semi-final.
Interestingly, out of all the players remaining in the draw, Khachanov has the best record against Zverev, winning three times. Yet the German has come out on top on six occasions, winning four of their last five meetings.
In the other blockbuster, all-American semi-final, Ben Shelton and Frances Tiafoe go head-to-head, looking to end their nation's wait for a Grand Slam title
Both players are coming off epic quarter-final victories. Shelton defeated defending champion Carlos Alcaraz at 3.30am, while Tiafoe came from two sets down to overcome Alex Michelsen.
Shelton leads the head-to-head 3-1. Tiafoe triumphed in their last meeting at the US Open in a five-set thriller in 2024, while Shelton reigned victorious in New York in 2023.