guerrero made the dodgers' 25-man opening day roster for the 2014 season. he made his mlb debut as a pinch hitter on march 22, 2014 against the arizona diamondbacks, but when diamondbacks manager kirk gibson countered by putting in a right-handed pitcher, dodgers manager don mattingly sent in a left-hander to pinch hit for guerrero. guerrero had his first official at-bat the next night, and struck out. after the two-game opening series in sydney, australia, guerrero was optioned to the triple-a albuquerque isotopes.