Jon Singleton has been promoted to Triple-A Oklahoma City, according to the Chronicle's Brian Smith.
In 17 games since coming off a 50-game suspension, Singleton is hitting .271/.397/.627 and in 11 games with Corpus, he was hitting .263/.396/.526 with 16K:9BB in 48 PAs.
This will be the first time the 21-year old has seen Triple-A.