The 26-year-old Szczur joins the Cubs for the seventh time this season. He is batting .217 (13-for-60) with four doubles, one homer and eight RBI in 35 games with the Cubs this year. Szczur has batted .292 (78-for-267) with 12 doubles, two triples, eight home runs and 31 RBI in 70 games with Iowa this season.
Szczur made his major league debut with the Cubs last August and batted .226 (14-for-62) with two doubles, two home runs and five RBI in 33 games. He has played 27 games in left field, 14 games in center field and 15 games in right field during his big league career. Overall, Szczur has batted .221 (27-for-122) with six doubles, three home runs and 13 RBI in 68 career major league games.
Ross, 38, is batting .190 (23-for-121) with seven doubles, one home run and seven RBI in 57 games with the Cubs this season.