Three young arms headline Week 20 waiver-wire targets in fantasy baseball: Michael McGreevy, Joey Cantillo, and Jack Perkins. McGreevy stranded six Cubs over six innings for his second win in a row, showcasing a groundball-friendly approach and a pitcher-friendly control profile that could help WHIP in the final stretch. Cantillo followed with a solid White Sox win, riding a devastating changeup that produced a whiff rate near league-best levels but accompanied by a troubling fastball and control concerns. Perkins flashed velocity and a multi-pitch mix for Oakland, delivering a quality start against Baltimore but carrying walk-rate risks that keep him as a “stream when needed” option. Rosters shifts noted: McGreevy 7%, Cantillo 13%, Perkins 7%.

Rosters aside, the fantasy takeaway is clear: McGreevy’s success came from suppressing hard contact and walking few, a repeatable skill that could yield steady innings and a workable WHIP in two months. Cantillo’s allure rests in the changeup, which pairs striking strikeout upside with a high contact-prone fastball that could crater ratios in bad matchups. Perkins’ upside rests on a high-velocity fastball and a nasty sweeper, with the cutter and changeup giving him a legitimate ceiling if he irons out walks and tightens his early-inning command. The Cubs, White Sox, and Orioles provided the surrounding context, while a Rockies tilt looms as a possible streaming spot for McGreevy.

For fantasy managers, Week 20 becomes a test of short-term upside against longer-term concerns. These three arms offer upside in deeper formats, but their margins are thin and matchup-driven. It’s a good time to chase upside with clear streaming slots, while balancing risk with established innings-eating options.