Per MLBTradeRumors.com:
DH/catcher Jeff Clement was pulled from the Tacoma Rainiers' lineup in the third inning tonight, according to Ryan Divish of The News Tribune. His analysis:
I have it on pretty reliable source that it is not injury related. Clement has been rumored to be part of possible trades already this season and maybe he is part of a package deal. Or perhaps, he is being called up in place of another player for the Mariners, who might be getting dealt.