Boston has many attractive candidates to explore trading at the deadline. JD Martinez has an opt-out at the end of this season, Brock Holt is having a career year, batting north of .335 as a utility man, and could provide value to any contender. The Red Sox could receive decent minor-league assets in return for these two players, however, if they want to hit the motherload, Mookie Betts is a free agent after the 2020 season and will be due for a Mike Trout-like contract. If Boston truly hits the reset button, Betts is the guy to start with when trying to rebuild a foundation.