Gael Monfils was no match for Dominic Thiem, who needed only 63 minutes to reach the final in Buenos Aires.
A day after ensuring he will become the oldest male world number one, Roger Federer beat Andreas Seppi to reach the Rotterdam Open final.
Petra Kvitova came off the ropes to beat Caroline Wozniacki and extend her winning run to 12 matches in Doha.
The first semi-final at the Rotterdam Open was cut short when David Goffin was hit in the face by the ball and suffered an eye injury.
Japanese star Kei Nishikori claimed a hard-fought 4-6 6-3 6-1 quarter-final win over Radu Albot on Friday.
Dominic Thiem earned his second final-four appearance of the season after defeating home favourite Guido Pella in straight sets on Friday.
Roger Federer became the oldest man to top the ATP rankings thanks to Friday's 4-6 6-1 6-1 win over Robin Haase at the Rotterdam Open.
Amid all the plaudits after becoming the oldest world number one, Roger Federer showed he has a sense of humour as he poked fun at himself.
Records will be shattered on Monday when Roger Federer once again sits atop the ATP world rankings.
Julia Goerges had to pull out of her quarter-final at the Qatar Open, allowing Petra Kvitova a walkover route to the semis.
A third semi-final of 2018 awaits Angelique Kerber, who defeated Karolina Pliskova in straight sets at the Dubai Tennis Championships.
A jury ruled in Eugenie Bouchard's favour in New York Thursday as the 23-year-old seeks damages from the USTA.
After a torrid 2017, Angelique Kerber's resurgence continued in Dubai, and Rainer Schuttler says she is back to her rightful top-10 ranking.
Clearly struggling for fitness, Stan Wawrinka was forced to retire from his Open 13 Marseille match against Ilya Ivashka on Thursday.
Talking about his early withdrawal at Open 13 Marseille, Stan Wawrinka said his left knee flared up in the first set.
Gael Monfils and Australian Open runner-up Marin Cilic returned Thursday and the former emerged triumphant in straight sets.
Juan Martin del Potro – the 2011 champion – went down 7-6 (8-6) 4-6 7-5 to 20-year-old American Frances Tiafoe Thursday.