As we move into June, the focus shifts to assessing player performance and identifying potential game-changers available on the waiver wire. With the market becoming increasingly sparse, several players under 40% rostered on Yahoo leagues have emerged as promising additions.

Nick Kurtz of the Oakland Athletics, recently returned from an oblique strain, is displaying immense potential with his impressive bat speed. Despite some contact issues, his recent performance suggests a possible breakout. Meanwhile, David Festa from the Minnesota Twins has shown flashes of brilliance with a 95 mph fastball and strong secondary pitches but needs to improve his command for a consistent impact. Lastly, Jake Mangum of the Tampa Bay Rays is carving out a niche with a solid batting average and speed on the basepaths, making him a worthwhile pickup for teams in need of depth.