Novak Djokovic wore down Lucas Pouille after an even first set, dispatching the Frenchman 7-6 6-1 in a Cincinnati Masters quarter-final.
Djokovic will face Daniil Medvedev in the semifinal, who continued his recent hot form, ousting Russian compatriot Andrey Rublev 6-2 6-3 in barely an hour.
Medvedev, a career-high eighth in the rankings, faced only one break point.
He has made two finals in the past two weeks, losing to Nick Kyrgios in Washington and Rafa Nadal in Montreal.
In other quarter-final action, Frenchman Richard Gasquet continued his comeback from groin surgery by defeating 11th seeded Spaniard Roberto Bautista Agut 7-6 3-6 6-2.
Gasquet set up a semi-final clash on Saturday with Belgian 16th seed David Goffin.
Goffin advanced when his quarter-final opponent, Japan's Yoshihito Nishioka, pulled out before their match due to illness.