Cam Gallagher hit a grand slam for his first career home run and second big league hit, and the Kansas City Royals beat the Oakland Athletics 6-2 on Monday night.

Gallagher’s shot into the left-field seats in the sixth inning marked the first grand slam by a Royals rookie since Paulo Orlando connected in the first game of a doubleheader against Tampa Bay on July 7, 2015.

Jake Junis (5-2), recalled for his seventh stint with Kansas City this season, allowed two runs and four hits in six innings with two strikeouts and no walks.

The Royals moved into a second-place tie with the idle Twins, five games back of AL Central-leading Cleveland.