By moving a win away from the Kremlin Cup title, Belinda Bencic sealed a place at the WTA Finals.
Former world number one Andy Murray will face Stan Wawrinka in his first ATP singles final since 2017.
Belinda Bencic will make her first appearance at the lucrative WTA Finals in China later this month, as Serena Williams misses out.
Former world number one Andy Murray was pushed all the way by Marius Copil before moving into the last four in Antwerp.
The door is open for Belinda Bencic to qualify for the WTA Finals after Kristina Mladenovic's defeat of Kiki Bertens in Moscow.
There was another encouraging performance from Andy Murray in Antwerp as he saw the back of eighth seed Pablo Cuevas in straight sets.
Russian Veronika Kudermetova claimed the biggest win of her career in Moscow, beating Elina Svitolina to reach the quarter-finals.
Daniil Medvedev decided not to chase a seventh straight final due to fatigue but Karen Khachanov thrilled fans at the Kremlin Cup in Moscow.