Seattle Mariners center fielder Franklin Gutierrez will miss at least four weeks and likely longer after suffering a partial tear of his right pectoral muscle. Gutierrez was injured Tuesday while making a throw from the outfield during a drill. He flew to Seattle on Wednesday and, after an MRI and a meeting with team doctors, the diagnosis was confirmed. Gutierrez will be held out of all baseball activities for at least a month and be re-evaluated at the end of March. He will miss all the spring training games and the Mariners' season-opening series against Oakland in Japan.