The Arizona Diamondbacks are certainly going to be sellers at this year's trade deadline, but what exactly do they have to sell? All-Star left-handed reliever Joe Mantiply could be on the move and Arizona also has to make a decision on whether or not to keep Christian Walker. David Peralta, Merrill Kelly and Jordan Luplow are few of the other names that could be moved at the deadline for the Diamondbacks. If you want to read the trade deadline outlook on the Arizona Diamondbacks, you can find it here: https://www.justbaseball.com/mlb/arizona-diamondbacks-trade-deadline-outlook/