Left - hander Matt Reynolds faced Montero and the former Diamondbacks ' catcher launched his 15th homer of the season to clear the bases for a 5 - 1 lead and his third career grand slam .
Montero is a left - handed hitter .
Left - hander Matt Reynolds faced Montero , a left - handed hitter , and the former Diamondbacks ' catcher launched his 15th homer of the season to clear the bases for a 5 - 1 lead and his third career grand slam .