Without a doubt, the biggest bat on the trade market before the July 31st non-waiver deadline is Orioles shortstop Manny Machado.
But not far behind him is Kansas City Royals third baseman Mike Moustakas. ESPN's Jerry Crasnick says the Moustakas trade talks are heating up:
The #RedSox and #Braves are both interested in Mike Moustakas as a trade deadline acquisition, sources say. The #Yankees have already been mentioned as a potential landing spot. There's enough of a market for Moose that it's more likely than not the Royals deal him this month.