Dominic Thiem has already sealed his place in the last four of the ATP Finals.
The Austrian, who beat both Roger Federer and Novak Djokovic in his opening two matches, will compete in the semi-finals in London for the first time.
Matteo Berrettini can no longer qualify for the last four after defeats by Federer and Djokovic.
Ahead of today’s clash, Thiem said: “I’m super happy and proud that I reached the semi-finals for the first time.
“It was a big goal, but of course it’s not enough now. I’ll try to play a good match against Matteo.
“It’s a little bit more comfortable now that I don’t have a lot of pressure in this match, but of course I want to continue the great shape and then [turn my] full focus on the semi-finals.”
Berrettini, 23, added: “These kinds of losses, they will help me in the future to get better.
“When I stepped in the locker and my coaches were there, I said, ‘Guys, I want to be better. I want to be able to beat those guys.’”
What time does Dominic Thiem vs Matteo Berrettini start?
The ATP Finals clash is scheduled to get underway at 2pm GMT.
How to live stream Dominic Thiem vs Matteo Berrettini
BBC Two will be showing live TV coverage of the match throughout the UK.
This means fans can stream the action for free via the BBC iPlayer app and on BBC Sport’s website.
Additional streaming is available through Amazon Prime Video.
New customers signing up can enjoy a 30-day free trial, which can be cancelled at any time.
A normal subscription with the streaming service costs £7.99 per month.
Fans can also stream the action via selected UK betting companies at no cost.
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