 For the first time in 2007, Rowland-Smith pitched for the Triple-A Tacoma Rainiers of the Pacific Coast League (PCL).He made 25 relief appearances for the team, posting a 3–4 record, a 3.67 ERA, 50 strikeouts, and 35 hits allowed in innings before getting promoted to the Mariners in June.Rowland-Smith made his major league debut for the Mariners on June 22, against the Cincinnati Reds in a game notable for being the return of longtime Mariners star Ken Griffey, Jr., to Safeco Field.