Wednesday was essentially the deadline for getting a deal done. It's the first day teams can unilaterally renew contracts for players on their roster at a certain salary. The Tigers haven't had to do so for a few years, and while they had a handful of players who went down to the final day, they avoided the process again.
Avila, Boesch and Jackson were all rookies last season. Perry and Kelly are a year away from arbitration.