Cleveland Guardians pitcher Luis Ortiz was placed on leave and is under Major League Baseball investigation for gambling, according to a person with knowledge of the situation.

The person spoke to USA TODAY Sports on the condition of anonymity due to the ongoing investigation.

ESPN reports that two pitches by Ortiz received unusual gambling activity: his first pitches of an inning in games on June 15 and June 27. Both pitches were sliders outside the strike zone. Some gambling sites allow users to bet on the first pitch of an at-bat.

The June 15 pitch to the Seattle Mariners’ Randy Arozarena was low and away leading off the bottom of the second. Arozarena walked and the Mariners went on to score four runs that inning. 

On June 27, Ortiz’s first pitch of the third inning, to Pedro Pagés, was even wilder, bouncing in the opposing batter’s box and going to the backstop. Pagés homered in the at-bat and the Cardinals scored three runs in the inning. 

Ortiz was originally scheduled to pitch Thursday, July 3 against the Cubs, the same day the league and club announced the investigation and his leave.