1. Osvaldo Bido
Osvaldo Bido is likely the most recognizable name only because he is the most recent former Pirate on this list. Originally an international signee by the Pirates in 2017, Bido made his MLB debut in 2023, working to a 5.86 ERA with a 1.50 WHIP (but a 4.10 FIP) in 50.2 innings spent in a swingman role. Neither his 20.3% K%, nor his 8.9% walk rate, were anything to write home about, but he was great at limiting hard contact, with an 87.5 MPH exit velocity and 4.4% barrel percentage. This helped him put up a 0.71 HR/9.
Bido was never a top prospect in the Pirates system. Both Soriano and Uceta (who was the Dodgers' 25th-best prospect, per MLB Pipeline in 2020) appeared on a top 30 prospect list at least once. While Bido showed flashes of potential, with a respectable 101 Stuff+, he still had a poor 4.63 SIERA and 4.94 xFIP (113 xFIP-). The Pirates ultimately non-tendered Bido, but he would go on tosign a minor-league contract with the Oakland Athletics to revive his career.
Bido once again undertook a swingman role for the A's, pitching 60.2 innings but putting up a 3.41 ERA, 3.36 FIP, and 1.09 WHIP. The right-hander's walk rate rose to 10%, but he saw his K% also rise to 24.3%. His ability to limit hard contact also improved. Bido had a near-identical 4.3% barrel percentage in Oakland as he did with Pittsburgh, but opponents had a meager 85.6 MPH exit velocity against him. His sinker and changeup both gained horizontal movement, which helped his Stuff+ rise to 105.
Bido did not have great underlying numbers. He had a SIERA of just 4.23 and an identical 113 xFIP- (4.63). However, he did improve in the former stat by a fair margin and also saw an uptick in pitch quality. We'll see how he does in 2025. The A's will likely give Bido more innings to work with, given he earned the playing time after a solid performance last year. While he is still far from a guarantee to succeed, the Pirates could probably use him as a long reliever right about now.