When you look at the baseball calendar -- the regular-season one, that is -- there are really only two times when player values tend to shift rapidly:
• The first is the first few weeks of April, as roles become crystallized and we get our first "real" glimpses of players in the given year.
• The second, and upcoming one, is the annual midsummer trade deadline, which this year arrives on Wednesday, July 31.
It's an exciting time ...
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