A trio of Pittsburgh Pirates prospects made some special history on the July 4 holiday, tossing a perfect game for the Greensboro Grasshoppers. Per @MiLB on social media: GREENSBORO SPINS A PERFECT GAME! @Pirates prospects Khristian Curtis, Jake Shirk + Michael Walsh (@GSOHoppers) spin the first 9-inning perfecto at the affiliate-level since 2017 🚨 GREENSBORO SPINS A PERFECT GAME 🚨 @Pirates prospects Khristian Curtis, Jake Shirk + Michael Walsh ( @GSOHoppers ) spin the first 9-inning perfecto at the affiliate-level since 2017 🎉 pic.twitter.com/wJhV2atQG9 — Minor League Baseball (@MiLB) July 5, 2025 Greensboro is the High-A affiliate of the Pirates, and they shut out Aberdeen (Orioles) 2-0.