A clogged pipe was to blame for a sewage backup at the Oakland A's stadium over the weekend that created a stink and pools of water in the clubhouses used by the A's, the visiting Seattle Mariners and the umpires. The two teams were forced to share the Raiders' locker room a floor above the baseball clubhouses after Sunday's game. The Oakland Tribune reports that officials found an unidentifiable mass in a sewer line. The mess has been cleared and everything is expected to be in order for the A's next home game on Tuesday.