De Los Santos was shelled in his start for High-A Lake Elsinore on Tuesday, allowing five earned runs on three home runs while failing to make it out of the first inning.
De Los Santos has been inconsistent since being called up to High-A a month ago, posting two quality starts and three poor ones for a 6.64 ERA overall. The 20-year-old Dominican right-hander pitched superbly in Low-A Fort Wayne earlier this season, posting a 2.91 ERA and 0.99 WHIP, and will hope to recapture that consistency as he moves forward.