After the 2012 season, Tyson Ross had a 5.33 ERA in 53 career games. He didn't strike out enough batters, he walked too many, and he allowed a ton of hits. He'd had some injury problems, and there were questions about his unorthodox delivery. He was struggling as a starter, and he was struggling as a reliever. He was only 25 and clearly talented, but the A's finally decided to let someone else take a crack at polishing this particular youngster. He was sent to the Padres in a low-level deal that brought Andy Parrino to Oakland.
In the three years since, Ross has posted a 114 ERA+ in 99 games for the Padres (80 starts) while striking out a batter per inning.