Rafael Nadal needed a set to get adjusted before unloading on Fabio Fognini for a 2-6, 6-1, 6-2 victory and a place in the ATP Montreal Masters semi-finals. He explained, "I'm playing very well right now".
In the tiebreak, Khachanov was down 0/2, then won four straight points, but Medvedev came back to win. "I'll talk to my team and we will see", he said.
Nadal advanced to the showpiece contest on a walkover when his semi-final opponent, Frenchman Gael Monfils, withdrew with an ankle injury before their meeting.
But Nadal broke to love in the second game of the second set on a double fault by Fognini, who appeared to be bothered by right ankle soreness as the almost two-hour match wore on.
Bautista Agut won the set comfortably and the third went to a tie break which Monfils led 5-0 before sealing victory with a huge forehand victor after more than two hours.
"Everybody knows he's one of the big talents on tour", said Nadal, who lost to Fognini in the third round of the 2015 U.S. Open.
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But the defending champion from the 2018 Rogers Cup in Toronto found his rhythm in the second, breaking Fognini, the seventh seed, in the second game when the world's 11th-ranked player double faulted to go down 2-0. "Will be great if I am able to make that happen". "In general terms [it was] an up-and-down match, but a positive match for me because I played better and better", Nadal said. "I had retired in Wimbledon".
Khachanov and Medvedev are 1-1 in their rivalry, having played each other in Moscow last season and in 2017 at the NextGen final in Milan.
Zverev, the third seed and No. 7 player in the world, slammed his racket in frustration in the first set, which elicited a negative reaction from the crowd. "Yeah, of course, it's extra special", he said. They rallied behind 19-year-old hometown hero Felix Auger-Aliassime, who beat countrymen Vasek Pospisil and Milos Raonic before falling in a riveting 6-7 (7), 7-5, 3-6 round-of-16 match against world No. 8 Karen Kachanov.
Medvedev fell to 1-7 all-time against the Big 3, with his only victory coming against Djokovic at Monte Carlo back in April. "Both of us, we don't like to play each other, so we were tense".
Friday night's match was suspended due to rain after Monfils won the first two points.