Alexander Zverev is into the semifinals. Carlos Alcaraz, meanwhile, needs to wait to see if he will reach the last four at the ATP Finals .
Zverev beat Alcaraz 7-6 5, 6-4 on Friday at the season-ending event for the year's top eight players.
Zverev won the group, finishing perfect with three victories. Alcaraz and Casper Ruud have one win each and Andrey Rublev has none.
Alcaraz needs Rublev to beat Ruud in the final group match later.
Top-ranked Jannik Sinner won the other group ahead of Taylor Fritz.
