Calvin Watkins covers the Houston Rockets and the NBA for ESPN.com. He joined ESPNDallas.com in September 2009. He's covered the Dallas Cowboys and Texas Rangers as well as colleges, boxing and high school sports.
HOUSTON -- The Rockets apologized Tuesday night to the Dallas Mavericks for an in-game tweet posted to their team account that used emoji imagery of a pistol situated next to a horse and text suggesting they should give in to an inevitable end.
