['batterName | Miguel_Cabrera', 'batterName | Perez', 'matchDate | June_20,_2003', 'pitchResult | connected', 'pitchResult | walk-off_homer', 'pitcherName | Dominic_Leone', 'pitcherRecord | 0-3', 'startsNumber | debut', 'teamName | Marlins']
Perez connected against Dominic Leone (0-3), becoming the first major leaguer to hit a walk-off homer in his debut since Miguel Cabrera did it for the Marlins on June 20, 2003.