New York Yankees pitcher Michael Pineda was ejected in the second inning against Boston on Wednesday after the umpire found a foreign substance on his neck.
Pitchers are not allowed to use foreign substances to give them a better grip on the ball.
Pineda, who missed the last two seasons because of injury but has enjoyed a strong start to the year with an ERA of 1.83, was also at the center of controversy in the Yankees win over the Red Sox on April 10.
He was believed to have used a foreign substance during that game but was not checked by the umpire.
The Yankees went on to lose Wednesday's game 5-1.
(Writing by Jahmal Corner in Los Angeles; Editing by Peter Rutherford; )