The Cubs called up their top prospect Thursday, but how often will they use him in an outfield crowded with All-Stars?

Owen Caissie, the No. 1 prospect in the Chicago Cubs' minor league system, went 0-for-4 in his major league debut at Toronto on Thursday. Batting fifth as Chicago's designated hitter, Caissie lined out twice and flied out against Blue Jays veteran right-hander Max Scherzer.

Owen Caissie, the Cubs' No. 1 prospect, will make his MLB debut in Thursday's game against the Toronto Blue Jays. He will be Chicago's designated hitter, batting fifth in the lineup.