Desiree Linden, a two-time Olympian and runner up in the 2011 Boston Marathon, finished the 42-kilometer race in two hours, 39 minutes, 54 seconds - a full four minutes faster than the second-place runner.
"I told her (Flanagan) anything I can do to help you let me know because I might drop out".
"It's supposed to be hard", said Linden, who wiped the spray of rain from her eyes as she made her way down Boylston Street alone.
Desiree Linden became the first American woman to win the Boston Marathon in 33 years Monday, ending a long USA drought on a rain-soaked day. She said didn't believe it when she was told she had finished second, or that she earned $75,000.
"I just feel like it's the time", the Bostonian said days before the race.
"She kind of nudged me and said, 'I'm going to hit the bathroom.' I was like, 'I'll kind of tuck in and try to bring you back to the group'".
"Yeah, I'm in shock about that", she said.
Linden almost ended the drought in 2011 when she was outkicked down Boylston Street and finished second by 2 seconds. "I have the utmost respect for who they are as athletes and as people".
Watch the incident play out in the video at the top of the page.
State University Sarah Sellers nee Sarah Callister at Weber State University
"For me, it's the best conditions possible", Kawauchi said with a wide smile through an interpreter.
The brutal conditions caused this to be the slowest women's race since 1978.
Sportsmanship among the Americans was on full display during the race, particularly when Linden held back toward the beginning of the race to help Flanagan catch up to the pack after stopping at a port-a-potty.
Lisa Larsen Weidenbach's 1985 victory was the last for an American woman - before the race began offering prize money that lured the top global competitors to the world's oldest and most prestigious annual marathon.
"I love this city, this race, this course", Linden said in a TV interview.
Linden, 34, and Flanagan, 36, were two of seven American women to finish in the top 10.
The win marked redemption for Linden, who performed in the elite field at Boston throughout her career and lost the 2011 Boston Marathon title by just two seconds. In November 2017, Flanagan won the TCS New York City Marathon - similarly becoming the first American woman to do so since 1977.
Yuki Kawauchi splashed through the pelting rain, temperatures in the mid-30s and wind that gusted as high as 32 miles per hour to win the men's race, passing defending champion Geoffrey Kirui in Kenmore Square to earn Japan's first Boston title since 1987 and the $150,000 first prize.
Mark Hughes slams Marcus Alonso for attempting to break Shane Long's leg
It could've broken his leg. "There were three officials within five to 10 yards so how each of them missed it is a mystery to me". Alonso is likely to face retrospective action after stamping on Long's calf in the first half at St Mary's.