It could happen, at least according to what Brittany Ghiroli of MLB.com has heard:
Tillman, who turns 22 in April, was 2-5 with a 5.40 ERA in 12 starts last season. He was widely considered the favorite to earn the fifth starter gig coming into camp and his 3.86 ERA in 16 1/3 innings this spring suggests that he has done little to lose the assignment.
However, including his excellent performance against the Red Sox this afternoon, David Hernandez now has a 3.00 ERA and an impressive 20/3 K/BB ratio over 15 spring innings. Jason Berken, previously thought of as a long-man or spot starter coming into camp, has a 2.84 ERA and 7/3 K/BB ratio in 12 2/3 innings.
Manager Dave Trembley described the competition like this:
Besides trying to cram almost every sports cliche imaginable in one sentence, it’s becoming clear that Tillman isn’t the lock we all thought he was.