Jerry DiPoto signaled that the Mariners intended to be buyers this summer, with a 1.5-game lead in the race for a Wild Card spot and one of the best and deepest rotations in baseball. The only thing that was missing was a little more offense — particularly at first and third base, where Donovan Solano and Ben Williamson weren't going to be enough.

It's MLB trade season! From the early deals to get things started to the last-minute rush of deadline day activity on Thursday, July 31, this is your one-stop shop for grades and analysis breaking down the details for every trade as they go down.

FOX Sports MLB reporters Rowan Kavner and Deesha Thosar will be grading the biggest trades in the league through the July 31 trade deadline. Here's how every team has done so far: Who else is involved: The Rockies received pitching prospects Griffin Herring and Josh Grosz

With the MLB trade deadline looming, the Arizona Diamondbacks have traded first baseman Josh Naylor to the Seattle Mariners in exchange for two pitching prospects. The Mariners sent their 13th-ranked prospect Brandyn Garcia and their 16th-ranked prospect Ashton Izzi in return, both pitchers.