In Week 19 of fantasy baseball, four starting pitchers are making waves, prompting managers to consider their roster spots. Michael Wacha of the Kansas City Royals boasts an impressive 3.38 ERA with a remarkable 1.48 ERA over his last four starts. He has been underappreciated, yet his consistent performance makes him a valuable addition in most formats.

Jack Leiter, pitching for the Texas Rangers, has shown improvement after a rocky start, allowing two runs or fewer in five of his last six outings. While his strikeout numbers are rising, caution is warranted as his overall metrics still raise concerns. Lucas Giolito from the Boston Red Sox has made a comeback after an injury-laden season, achieving a 3.57 ERA but faces potential regression due to underlying metrics. Finally, Will Warren of the New York Yankees has flashed potential but remains inconsistent, limiting his immediate fantasy viability.