Oscar Rivera, who was kept out of the Caribbean Series by Mexico because of a strained chest muscle, threw a pain-free bullpen session Saturday.
Rivera, a 24-year-old lefty, is in Rockies camp with the agreement that if the organization wants to keep him, it will pay $1.3 million to his Mexican League team for his rights. He’s something of a long shot to make the team out of spring training, but the Rockies could pay the fee and still send him to Triple-A.