The Mariners will need to trade some prospects in order to become World Series contenders, and here are two that should be on the move.

Coming out of the MLB All-Star break having lost seven of their last nine games and dealing with an injury-depleted pitching staff, the Los Angeles Dodgers have their sights set on adding arms prior to trade deadline.

That's what I've done below, identifying four players I believe to be compelling under-the-radar trade targets. What, exactly, does "under-the-radar" mean? Essentially, that you aren't going to find these players bandied about constantly in trade rumors,