"I was more committed and a step further in, adjusting my position slightly realizing the ball does fly a lot", Federer was quoted as saying on the ATP World Tour's Web site.
In the semis, the 36-year-old Swiss and the second seed in Montreal will face Robin Haase (52 ATP). In the victory, Federer won 81 percent of his first serve points and 72 percent of his second serve points.
Shapovalov, who needed a wild card to gain entry into the tournament, continued his cinderella run Friday by rallying to beat Frenchman Adrian Mannarino 2-6, 6-3, 6-4.
'I'm happy I'm playing as well as I am this year on the match courts.
The fourth-seeded Zverev, seeking a second tournament title in as many weeks, advanced to the final on Sunday against second-seeded Roger Federer, a 6-3, 7-6 (5) victor over unseeded Robin Haase of the Netherlands.
Shapovalov won seven of the final eight points of the third set tiebreaker before closing out the match with a forehand victor down the line.
"He played well", Nadal said.
The delays, which all came during the first set, appeared to boost the sixth-seeded Dane, who was trailing 3-0 when the match was interrupted.
"I wanted to play a great tournament, and I think I did have a good week", Bautista Agut told reporters.
He said he stuck around to watch the match and remembers how Igor Andreev, Nadal's opponent, rolled his ankle but still tried to battle it out, not unlike how Shapovalov himself has been powering through adversity this week.
"Almost every tournament I've played this year there has been a rain delay so at this point I just have to laugh because I feel like it is following me", she said during a courtside interview after the three hour 26 minute match.
He never gave up on a point, a game or a set.
"I started off pretty slow, just drained from yesterday". "I was not as fast". I haven't played him that much yet. "I've seen some great atmospheres over the years".
Fourth-seeded Alexander Zverev of Germany rolled into the quarterfinals with a 6-4, 6-3 victory over 16th-seeded Nick Kyrgios of Australia, and Kevin Anderson of South Africa eliminated Sam Querrey of the United States 6-4, 6-1. So, these statistics are a bit ridiculous, because I have a lot of respect for David. But my game plan worked better against Bautista-Agut than against Ferrer.
"Then this kind of eats you up inside mentally", he said. It drains you because you know you can do better, but actually your own body is not letting you.
The stirring comebacks that 18-year-old Shapovalov used to become the youngest player to reach the semifinals of a Masters 1000 Series tournament died out when 20-year-old Zverev proved a little sharper and downed the Richmond Hill, Ont., lefthander 6-4, 7-5 on Saturday night.