A look at the biggest mistake the Atlanta Braves made at the 2026 MLB trade deadline and its impact on their 2026 World Series hopes. The Atlanta Braves entered Monday’s MLB trade deadline at 67–45 with an off night on the schedule. Atlanta’s biggest mistake, however, was failing to acquire a playoff-caliber starter to slot behind veteran ace Chris Sale. Mahle had a 4.38 FIP, and Atlanta believes an adjusted pitch mix could improve his troublesome results against right-handed hitters. None addresses the difference between surviving the schedule and winning a short postseason series.