Szczur is in the starting lineup in left field for Monday night's game against the Los Angeles Dodgers. He is beginning his fourth stint of the season with the Cubs, and has hit .167 with six RBIs in 23 games.
Schwarber was sent to Triple-A after driving in two runs during Chicago's 8-0 win at Minnesota on Sunday. The 22-yearold catcher hit .364 with one homer and six RBIs in six games after making his big league debut.
The Cubs had called up Schwarber from Double-A Tennessee to primarily be the designated hitter during a string of interleague games at AL parks. He was the overall No. 4 pick in last year's draft and will be making his first appearance at the Triple-A level.