The Mariners have signed fifth-round pick Tyler Marlette for $650,000. That's the highest bonus outside of the first four rounds so far in 2011, and is nearly four times MLB's $165,600 guideline for his No. 153 slot.

A catcher from Hagerty HS (Oviedo, Fla.), Marlette was the MVP of the 2010 Aflac all-star game, during which he homered at Petco Park. He's an excellent athlete for a backstop, and his arm and power are plus tools. He had committed to Central Florida.