Baker signed a minor league contract with the Mariners on Tuesday, and received an invite to spring training, CBS Sports' Jon Heyman reports. There is no reason the 34-year-old catcher cannot win the backup job behind Mike Zunino in Seattle, as they could value his veteran presence. However, Baker hit .192 with zero home runs and zero steals in 208 plate appearances last year with the Cubs. If he didn't bring excellent qualities in the clubhouse and working with young pitchers, he would have been out of the big leagues years ago.