Joba Chamberlain made 15 throws in his second session on a half-mound at the team's Minor League complex in Tampa, Fla., on Friday. The right-hander is continuing his rehabilitation from Tommy John surgery performed in June. Chamberlain said was "happy with the progress and feeling good" after throwing off the five-inch mound. He is conservatively expected to rejoin the Yankees before the All-Star break, though he is unlikely to be on the club's Opening Day roster.