Garrett Olson clears waivers, headed back to Buffalo

LHP Garrett Olson has cleared waivers, and is headed back to Triple-A Buffalo, according to Adam Rubin of ESPN New York.

Olson was designated for assignment when Johan Santana was activated from the disabled list on Saturday.

Olson made one appearance for the Mets and allowed four earned runs in 1/3 of an inning.