The Rays activated Boyle (elbow) from the 15-day injured list Monday and optioned him to Triple-A Durham.
Boyle had made three rehab starts after overcoming a right elbow strain, but he struggled mightily in his outing Sunday with Durham, allowing five runs with a 0:4 K:BB over 1.2 frames. Rather than sticking Boyle back on the big-league roster, the Rays will have him continue making regular turns through the Triple-A rotation.