JA Happ would have preferred to start the game against the Rays rather than come on in relief:

But he did say he would have preferred to have started the game if he was going to pitch and Happ added the team knew that was the case.

“When I’m in there, you’ve got 100 percent of me,’’ Happ said. “I wasn’t worrying about when I was coming in.”

He added he was “initially” surprised by the plan, but took ownership of his poor outing.

NYPost.com

Happ made plenty of relief appearances in his career, so warming up the in bullpen during the game was not new. I can see how this might have been a different mindset for him, and players do like consistency.