Top seed Andy Murray cruised past Spain's David Ferrer 6-2 6-3 on Saturday and Bulgaria's Grigor Dimitrov received a walkover into the China Open final after Milos Raonic withdrew due to an ankle injury.
The 29-year-old Murray, who is yet to drop a set this week, sealed victory in one hour 31 minutes, his seventh successive win over fifth seed Ferrer.
The big-serving Raonic was forced to play twice on Friday, beating Tunisia's Malek Jaziri and Pablo Carreno Busta to advance to the last four and he sustained the injury during the win over the Spaniard.
"Yesterday during my second match in the evening, I rolled over my ankle, obviously caused it some level of a sprain," the Canadian told the ATP website.
"I did a test this morning, which showed I had a partial tear on the outside of my ankle. I was told to give it a try. I tried to warm up just before the match like I would normally, and I was unable to play."
Murray, through to the China Open final for the first time, has enjoyed one of the best years of his career, winning Wimbledon and the Olympic gold medal.
World number one Novak Djokovic pulled out of the tournament due to injury.
Raonic pulled out of his semi-final match a few hours before it was due to start.
"Yesterday during my second match in the evening... I rolled over my ankle, obviously caused it some level of a sprain," Raonic told reporters.
The sixth-ranked 25-year-old has been stalked by injuries all season, costing him the chance to bag his first Grand Slam title.
He was two sets up to Murray in the Australian Open semis when he suffered a thigh injury, eventually losing in five.
The big-serving Canadian was also tipped to make a run for the crown at Flushing Meadows, but fell in the second round after again injuring himself on court.
Murray made quick work of Ferrer for a place in the finals.
The Spaniard had lost his previous six matches against Murray and failed to get a look in after the Scot went two breaks up in the first set.