#1: Ben Brown
While his oblique injury prevented him from getting the call as rosters expanded, Ben Brown should be right back on the radar to come up as a potential bullpen upgrade for the stretch run and the postseason. Brown is still considered one of the Cubs' best pitching prospects and he showed why in his recent return to the mound. While he only pitched one inning, he flashed around 95-97 mph with his fastball and posted a pair of strikeouts.
Of course, he wouldn't be on the radar in the first place without what he did in the first place to end up there. Brown's Triple-A season has been up and down with a 4.77 ERA, but much of the damage can be traced to three blow-up starts which make up only six of the 80 innings he's thrown. Before going on the IL, he posted three strong starts in a row, giving up only three runs in 15 innings while racking up 16 strikeouts.
Brown has the build of a scary back-end reliever with a high 90s fastball combined with a wipeout curveball. Control is still a slight issue for him, but there's hope that a move to the bullpen will be beneficial for his long-term future like Justin Steele before him. He has the talent to carve out a spot for himself and, come playoff time, it couldn't hurt for the Cubs to have another arm that could reliably miss bats.