Unbeaten boxer Floyd Mayweather will fight UFC lightweight champion Conor McGregor in a much-discussed boxing match on Aug. 26 in Las Vegas, a well-placed source told Yahoo Sports on Wednesday. Mayweather is expected to make the announcement on social media as early as Wednesday. Terms of the deal were not available, but it will either be at the MGM Grand Garden or T-Mobile Arena in Las Vegas. The Nevada Athletic Commission on Wednesday approved the request from Mayweather Promotions to put on a boxing card on Aug. 26 at the MGM Grand. The venue could change, however, to T-Mobile.