Learn how UCAN helped fuel Sara Hall's success in London.

Those running include Emily Sisson, Stephanie Bruce, Deena Kastor and Meb Keflezighi.

You know about Meb's silver and the attack on leader Vanderlei de Lima, but do you remember Stefano Baldini's incredible 28:59 close in 80+ degree temps that featured a 14:12 5k from 35k to 40k or the Austrian guy in a fuel belt? This remains the only Olympic marathon since 1980 not to feature an African in the top six -- and a reminder of how the Olympic marathon, with its hot weather and three-athlete-per-country limit, can produce unexpected results. No one would have predicted a podium of Italy, the United States, and Brazil in 2004. We can only guess what Sapporo has in store...

Also racing are Sally Kipyego, Betsy Saina, Buze Diriba and Mamitu Daska. On the men's side, Meb Keflezighi is racing as last year's winner Daniel Chebii leads the field with Stephen Sambu, Abdi Abdirahman, Chris Derrick and more.

A generation of excellence is what Meb's career was all about.

The 24-year old Geoffrey Kamworor had accomplished an awful lot in his young career but he'd never won a marathon until today.

We also heard Jared Ward dish on the #2 BYU men, Shadrack Biwott discuss his move to Hansons-Brooks, and spoke with the NAZ Elite duo of Kellyn Taylor & Stephanie Bruce.

Generation UCAN fuels America's best marathoners.

Four real high-quality American men that will battle in NY this weekend - past champ Meb Kefelzighi, Olympic sixth placer Jared Ward, the ageless Abdi Abdirahman and Shadrack Biwott, who has been top 5 in his last 2 majors.

Meb isn't just going through the motions for his last race. "I'm healthy, which is a big battle, I hope to be very competitive. I'm here up in Mammoth Lakes, away from my wife and kids for five weeks. I want my last one to be a good one. Many people think it's going to just be a show, but I would regret if I didn't give it everything I had. I usually would be fearless going out there competing against the best of the best. We all know that the mind and the body need to be on the same page."

Two of America's biggest marathon stars don't know what to make of Galen Rupp's win in Chicago due to the ongoing USADA investigation. Meb Keflezighi said he was happy for Rupp and Salazar but added "there's a lot of speculation going on and I would love to know what’s going on and how far it’s gotten." *MB: Breaking: Shalane and Meb react to Galen Rupp's Chicago Win

Other top Americans include Shadrack Biwott, Christo Landry, Neely Gracey, Stephanie Bruce, and Aliphine Tuliamuk.

Get the inside scoop from Friday's press conference. What racer did famed coach Renato Canova call a "big talent?" What does Wesley Korir think of Jemima Sumgong being busted and can Luke P rebound from his disaster in Chicago?

As Meb Keflezighi prepares to race his final Boston Marathon, he looks back and shares some of his favorite memories from Boston.

LRC supervisitor David Graham has rolled out his 2016 world rankings plus plenty more thoughts on the year in men's marathoning. Obviously the great Kipchoge is #1, but where does Rupp rank?