Washburn (3-0) has won his first three decisions for the first time since he started his career 4-0 in 1998. He gave up two runs in the first, matching his season total for earned runs entering the game, then limited the Rays to three hits the rest of his outing.
Washburn was 5-14 with a 4.69 ERA with the Mariners last season.
Johnson's triple was part of Seattle's three-run fourth against Andy Sonnanstine (0-2) as the Mariners spoiled Joe Maddon's 500th game as manager of the Rays.
Evan Longoria hit an RBI double and Pat Burrell singled in a run in the first for Tampa Bay.
At Baltimore, Brad Bergesen allowed one earned run in his major league debut, Aubrey Huff homered twice and the Orioles ended a five-game losing streak.
Recalled from Triple-A Norfolk before the game, Bergesen gave up three runs and four hits in 5 2-3 innings. The right-hander struck out five, walked two and hit a batter.
The 23-year-old Bergesen (1-0) outpitched veteran Jose Contreras (0-3), who yielded six runs and seven hits in 5 1-3 innings. Contreras has lost each of his three starts this season.
Nick Markakis went 4-for-4 with a walk for Baltimore, and Luke Scott was 3-for-4 with a walk. Huff finished with four RBIs.
Chicago's Carlos Quentin, who leads the majors with seven home runs, was 0-for-3 in his bid to homer in a fourth straight game.
You don't need a scorecard to discover what ails the Angels. Just walk through the front gate of Angel Stadium and into the main concourse, where the Angels have wrapped pillars with larger-than-life portraits of their best players.
There's Vladimir Guerrero, right in front of you. He's on the disabled list.
Take two steps to the right, and there's John Lackey. He's on the disabled list too.
