Parker diagnosed with lateral elbow impingement

Jarrod Parker has had two Tommy John surgeries and a third operation on the same elbow. (AP Photo/Morry Gash, File)MESA, Ariz. -- A's right-hander Jarrod Parker suffered a setback during his latest throwing session Thursday, leaving the backfields of Hohokam Stadium in pain after throwing a pitch while facing hitters for the first time this spring.

The severity of the setback is unknown, but the A's are expected to provide details on Parker's status this afternoon.