Mariners reliever Chasen Bradford was reinstated from the 10-day injured list and fellow right-hander Ruben Alaniz was optioned back to Triple-A Tacoma as Seattle moved to bolster its bullpen prior to the start of its two-game Interleague series with San Diego on Tuesday.

Bradford had been on the IL since April 9 with inflammation in his right shoulder. He had pitched in five games this season, with a 4.26 ERA and one save in 6 1/3 innings. The 29-year-old owns a career 3.75 ERA with a 7-0 record in 79 appearances over the past three seasons.

Alaniz made his Major League debut with Seattle after being recalled from Tacoma on April 12, but he struggled in four appearances while allowing 10 runs (nine earned) in four innings. Alaniz, 27, gave up 11 hits -- including three home runs -- with three walks and six strikeouts.

“He learned a lot,” Mariners manager Scott Servais told reporters in San Diego. “You leave pitches in the middle of the plate in this league, against good hitters, you pay the price. And he did. I think he’ll be better next time when he comes back.

“I think he got a little bit of shock value. You’ve got to finish. You’ve got to have an idea of where the ball’s going. Like I said, you stay in the middle of the plate and it doesn’t end well. We gave him a couple things mechanically to work on, to be more consistent with the location of his pitches. We’ll see how it goes from there.”

Alaniz will return to the bullpen for Tacoma, where he had posted a 2.70 ERA in 3 1/3 innings in his first two appearances. He signed with the Mariners last winter after spending nine Minor League seasons with the Astros, Tigers and Rays.