World number two Roger Federer is on course for an eighth Cincinnati Masters title after he book his spot in the semifinals for the eighth time with a three-set win over Stanislas Wawrinka in an all-Swiss quarterfinal clash on Saturday.
The 20-time Grand Slam champion had earlier beaten Leonardo Mayer of Argentina 6-1 7-6 (7-6) in a last 16 clash on Friday to advance into the quarterfinals.
The 37-year-old lost the first set to Wawrinka but recovered to take the subsequent two sets and book his semifinal spot with a 6-7 (2-7) 7-6 (7-6) 6-2 win over the three-time Grand Slam winner.
He has now 21 games from 24 meetings with Wawrinka.
The latest victory over his compatriot was his 45th at the tournament from 53 games only.
Roger Federer will be hoping to continue the quest to add to the previous seven titles he won during the 2005, 2007, 2009, 2010, 2012, 2013 and 2015 editions when he faces David Goffin of Belgium for a place in Sunday’s final.
Goffin had earlier seen off Argentine tennis star Juan Martin Del Potro 7-6 (7-5) 7-6 (7-4) to secure a last four spot.
Former World number one Novak Djokovic will face Marin Cilic of Croatia in the other semifinal.
Djokovic beat Canadian Milos Raonic 7-5 4-6 6-3 in their quarterfinal clash, while Cilic defeated Pablo Carreno Busta of Spain in straight sets 7-6 (9-7) 6-4.