Dell Diamond is the home stadium of the Round Rock Express, the Triple-A Minor League Baseball affiliate of the Texas Rangers major league baseball team. On April 16, 2000, the then-Double-A affiliate Express played their first home game at the stadium.

The Round Rock Express are a Minor League Baseball team of the Pacific Coast League (PCL) and the Triple-A affiliate of the Texas Rangers. They are located in Round Rock, Texas, and play their home games at the Dell Diamond. The team is named for Baseball Hall of Famer Nolan Ryan, who was nicknamed "The Ryan Express." Ryan, along with son Reid Ryan and Don Sanders make up the team's ownership group, Ryan Sanders Baseball.