Lajovic, who will take on either 11-times champion Rafa Nadal of Spain or Italian Fabio Fognini, trailed 3-0 in the opening set before going through the gears.

US Open
Thiem playing as consistently as the 'Big Three' - Medvedev
12/09/2020 AT 08:20

The 10th-seeded Medvedev could not hold the pace as whirlwinds swept across centre court at the Monte Carlo Country Club.

Lajovic quickly moved 4-0 up in the second set against a frustrated opponent, who bowed out on the second match point.

US Open
Thiem beats Medvedev to set up US Open final with Zverev
12/09/2020 AT 02:29
US Open men
Thiem predicts 'great' clash against Medvedev
10/09/2020 AT 09:46