Rey Mysterio's contract is the next major WWE deal to expire, in about two months or so. Rey has one of the highest downsides but is also one of the biggest merchandise movers for the company
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Usually at this point WWE officials would be aggressively trying to get Rey to sign a new deal but that has not really been the case.
Speaking of Mysterio, the reason he was booked on Northern California shows last weekend instead of his hometown San Diego is because officials felt he's been booked too often in San Diego. San Diego ended up drawing the worst crowd of last week.