Gausman's first pitch to Urena was a 97 mph knee-high fastball that sailed behind the batter, and plate umpire Jeff Nelson immediately signaled the ejection.
The game was Urena's first against the Braves since he was suspended for six games for intentionally hitting Atlanta's Ronald Acuna Jr. on the arm with a pitch in August, triggering a bench-clearing confrontation.
The Braves beat the Marlins 7-2. Urena (1-5) allowed five runs in six innings. In 15 career appearances against the Braves, he's 2-7 with an ERA of 6.07.
The Associated Press contributed to this report.