The 2023 MLB season is here.  Seattle hosts the Cleveland Guardians tonight for Opening Day at T-Mobile Park.  The Mariners tabbed right-hander Luis Castillo as their starter for the opener.  Opposite him is fellow right-hander Shane Bieber for Cleveland.  Seattle finished last season 90-and-72 and made the playoffs for the first time since 2001.  The M's notably added Teoscar Hernandez, AJ Pollock and Kolten Wong in the offseason.