What happened in the 2016 Olympic marathons where several athletes including Eliud Kipchoge and American stars Galen Rupp and Shalane Flanagan were given secret shoes, made to look like other shoes on the market, that scientists believe produce 2% gains in performance was "mechanical doping." Will World Athletics acknowledge this fact and potentially invalidate the 2016 Rio Olympic men's marathon results?

The famed coach reveals why he thinks Geoffrey Kamworor, Caleb Ndiku and Bedan Karoki struggled at the Olympics and how Kenya couldn't even put one man in the 5k final. He also discusses Asbel Kiprop's tactical struggles, tells you who will be the 2020 Olympic 5000 champ, and what he learned from his stint as a coach in the Chinese federation. Did you know that in 2014, not one Chinese man broke 14:00 for 5k or 29:30 for 10k?

D'Agostino said she had a sense, even before her race, that something special might happen. "I felt this affirmation that yeah, I really am going to be there for some reason other than this race performance."

Farah cemented his place in Olympic history by joining Lasse Viren as the only man in history to pull off the 5K/10K double at two Olympic Games. Behind him, three DQs saw 41-year-old Bernard Lagat almost win Olympic bronze, but two reinstatements later he was relegated to 5th as USA's Paul Chelimo was the shock silver medalist and Ethiopia's Hagos Gebrhiwet got the bronze.  

Centro used tactical brilliance and a 50.62 last lap to earn America’s first gold medal in the men’s 1500 in since 1908. Defending champ Taoufik Makhloufi was silver as Nick Willis got his second Olympic medal in third. Asbel Kiprop only 6th; USA's Ben Blankenship was 8th. *MB: MATT MF CENTROWITZ

Kipchoge has won six of his seven career marathons (including four straight) and is coming off one of the greatest marathon performances in history (his 2:03:05 CR in London). He's certainly the favorite, but this will be his first marathon without rabbits. He'll be challenged by NYC champ Stanley Biwott, Dubai champ Tesfaye Abera, Boston champ Lemi Berhanu plus reigning Olympic champ Stephen Kiprotich and reigning world champ Ghirmay Ghebreslassie.

It's been a great meet for Team USA but could get even better.

Dream do become reality.

Crouser threw the shot 4 feet further than he did a year ago thanks to being able to focus on it being done with his masters in finance.

Team USA almost got all three of it's 1500 men into the final but a DQ will keep Robby Andrews, even if American mile record holder Alan Webb doens't agree with it.

Farah looks like a lock for gold after winning the 10k, but with no Kenyans in the final for the first time since 1980, the question is who earns the other medals?

Tonight, you have to turn on the tv at 7 pm ET as the US will race itself in a re-run of the 4 x 100.

If you were in the Olympics, would you protest to get a competitor who trounced you in a race DQd for stepping on a line more than a mile from the finish line? The French should be ashamed. They are supporting the "win at all costs" mantra which is the same mantra that has resulted in the multiple doping scandals that are threatening the popularity of the Olympics.

After CAS overturned the IAAF's hyperandrogenism policy last year, Semenya has been unstoppable; the only question in Rio is whether she wants to break the world record. World Indoor medallists Francine Niyonsaba of Burundi and Margaret Wambui of Kenya are the favorites for silver and bronze, though Canada's Melissa Bishop and Kenya's Eunice Sum both have a shot.