As the MLB All-Star break approaches, savvy fantasy baseball managers are scouring the waiver wire for potential upgrades. Key players like Chandler Simpson, Jac Caglianone, Otto Lopez, and Emmet Sheehan are making headlines with promising performances. Simpson has been a solid outfielder option with a 32% roster rate, while Caglianone, now with the Marlins, is showing versatility as a first base and outfield prospect. Lopez continues to shine, boasting impressive stats with a .354 average over his last 12 games. Meanwhile, Sheehan's emergence as a valuable pitcher makes him a target for teams looking to bolster their rotations. Additionally, Colby Thomas's promotion from the Oakland A's adds depth to their lineup, especially against left-handed pitching.