Roger Federer will miss the Rio Olympics, and the rest of the 2016 season, due to a knee injury.
Usain Bolt knows his sport needs him to "come out on top" in light of the tensions caused by the Russian doping scandal.
Olympic sports now available on NBCSN, Universal HD (separate from Universal Sports Network), & streaming on NBC Sports Live Extra.
At least 105 Russian athletes have been banned from Rio in connection to the recent doping scandal, including gold medalist Alexander Dyachenko.
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At least eight Russians are set to miss the Olympics under new IOC rules.
The IOC says it is leaving it up to global federations to decide which Russian athletes to accept in their sports.
The 2016 U.S. Olympic team was officially confirmed Saturday for the Rio Games.