BOSTON — Sheri Piers of Falmouth celebrated her first Boston Marathon as a masters runner with a joyous jaunt down Boylston Street Monday afternoon.

Piers, who turns 41 next month, was the first American across the line, the second female masters runner and the 10th woman overall. She won $9,200 in prize money.

“This is my kind of weather,” Piers said of the unusual heat that climbed into the upper 80s on the 26.2-mile course between Hopkinton and Copley Square. “My plan today was to not even worry about my watch, because I tend to get fixated on the watch, and I didn’t today. I was just trying to run for place and catch as many people as I could.”

Piers finished in 2 hours, 41 minutes, 55 seconds – a little over a minute behind masters champion Svetlana Pretot of France and 10 minutes behind women’s winner Sharon Cherop of Kenya.

Wesley Korir, also of Kenya, won the men’s race in 2:12:40. Nick Wheeler of Rockland was the fastest Mainer Monday. He finished 32nd among men in 2:33:30.

“I took a ton of water,” and ran under every garden hose he saw, Wheeler said. “I made sure I kept myself cool, because I knew that would be the key.”

Joan Benoit Samuelson of Freeport accompanied her daughter, Abby, through a time of 3:28:13.

“That was probably the first time my mom walked during a marathon,” said Abby, who briefly strolled through two late water stops. “I was getting dizzy. It was brutal out there.”