Clearing Dunn from the roster was more a procedural mechanism than anything else at this point. The 34-year-old has indicated he is likely to retire at season’s end, and has already played out his contract. Over a short sample in Oakland, he put up a .634 OPS that dropped his season line to .219/.337/.415 over 511 plate appearances.
In De Leon, the A’s have picked up a hard-throwing reliever who has accrued minimal service time. The 27-year-old has thrown just 17 1/3 MLB innings, allowing ten earned runs and both striking out and walking ten batters. He was much better over 68 2/3 frames in the upper minors this year, however, posting a 3.01 ERA and posting 8.0 K/9 against 3.0 BB/9.