Jessica Pegula races past Liudmila Samsonova in less than an hour to win Montreal

WATCH: Jessica Pegula rolled to her second WTA 1000 title with a 6-1, 6-0 win over Liudmila Samsonova in Montreal.

A marathon week of women's tennis in Montreal ended with a lightning-quick championship victory for Jessica Pegula.

The American won her third career WTA singles title, and second at WTA 1000 level, with a 6-1, 6-0 victory over Liudmila Samsonova in Sunday evening's final. She's the first American woman to win the singles title north of the border since Serena Williams won in Toronto a decade ago. The last to win the event in Montreal was Monica Seles in 1998.

Pegula hit 16 winners, including five aces, to just three unforced errors in the match, broke Samsonova five times, and did not lose a point behind her own first serve. She also never faced break point.

"t feels great. I had, again, really consistent results all year this year: Finals at Doha, semis last week of D.C., a couple more quarterfinals," Pegula told reporters after the match. "I worked through. Beating Coco [Gauff, in the quarterfinals] and beating Iga [Swiatek in the semifinals] were two really tough wins back-to-back, and being able to do that and then just come out today and play a really clean match was kind of great.

"I felt like I didn't have a ton of pressure at any point or I wasn't worried too much today. But, yeah, it's always nice. We're out on tour to win tournaments and to win titles every single week, but tennis can be really tough where you sometimes lose a lot. Even when you're winning a lot of matches, you're still not winning tournaments, so it can get tough.

"Winning a week like this week makes it all worth it and makes you want to keep going for more. I'll be right back at it tomorrow in Cincinnati."

With two Top 5-wins already for the week, a fourth match in less than 36 hours proved a bridge too far for Samsonova, who was competing in her first WTA 1000 final.

The 15th seed defeated No. 2 seed Aryna Sabalenka and No. 12 seed Belinda Bencic back-to-back on Friday before rain pushed her semifinal against No. 3 seed Elena Rybakina from Saturday night to Sunday afternoon; she beat the Kazakh 1-6, 6-1, 6-3, but lost 11 straight games against Pegula, whom she was 1-2 all-time against, in three three-setters, entering the final.

"I know obviously physically she wasn't feeling her best, but at the same time I played a really clean match," Pegula said."I don't really think I made any unforced errors or anything. I played kind of a perfect match.

"I feel like I did enough to where, yeah, I could just play freely, and I kept trying to get the break and just hold for as long as I could until I won the match."

In five matches entering the final, Samsonova logged 10 hours on court; in addition to her three-setters against Sabalenka, which lasted nearly three hours, and Rybakina, she also went the distance against Katerina Siniakova in the first round.

"I was believing in myself until 6-1, 3-0," Samsonova said. "I was trying to do something to stay positive. Then I started to think, 'Okay, maybe today it's going to be really hard.'

"It was a tough week for me. So many matches, so many experiences, tough weather, but at the end I made such an incredible result. I'm so happy."

Samsonova dropped to 4-2 in her career in WTA singles finals. She was also runner-up to Bencic in Abu Dhabi in February.