諾蘭·萊恩
Round Rock is home to the Round Rock Express, a Triple-A Minor League Baseball team of the Triple-A West, owned by RSR Sports (Nolan Ryan, Don Sanders, Reid Ryan) and was founded by Reid Ryan, son of Baseball Hall of Famer Nolan Ryan. As of August 2010, Nolan Ryan is also the new owner of the major league Texas Rangers ball club. Home games for the Express are played at the Dell Diamond, a facility that is owned by the City of Round Rock and leased long-term to RSR Sports, which runs and maintains the facility.