The D'Backs signed Luis Ayala to a minor league deal, according to Jon Paul Morosi of FOX Sports (via Twitter). D'Backs relievers have combined for a 7.90 ERA this year, so GM Josh Byrnes added a low-risk arm to his 'pen. The club added Saul Rivera earlier in the week, only to see him surrender five runs in his first appearance.
Ayala signed with the Dodgers this winter and appeared in 14 Triple A games this year, where he posted a 4.50 ERA with 6.4 K/9 and 4.5 BB/9. As Nick Piecoro of the Arizona Republic notes (via Twitter), the 32-year-old right-hander was recently released.
Ayala posted a 5.68 ERA with four major league clubs over the course of the last two seasons. Last year, he mixed a low 90s fastball with sliders and the occasional change to strike out about twice as many batters as he walked. Ayala has had much more success against right-handed batters over the course of his career.