PHOENIX -- A day after allowing four earned runs in the ninth inning, relief pitcher Mike Zagurski was designated for assignment on Saturday and the D-backs recalled Bryan Shaw from Triple-A Reno.
The move leaves the D-backs without any left-handers in the bullpen.
"I know [general manager Kevin Towers] has been doing this a long time," D-backs manager Kirk Gibson said. "We have righties that get lefties out. We just have to approach it differently. There have been bullpens without lefties that have done well."
Shaw appeared in 43 games with the club to begin the season, but the D-backs sent him to Reno on July 22 after he allowed 10 runs (eight earned) over a 4 1/3-inning stretch.
The 24-year-old is 1-4 with a 4.26 ERA on the season.
At the time of his demotion, the D-backs told Shaw they wanted him to work on throwing his cutter less because he was becoming predictable to hitters. The righty said he did just that and feels much more confident attacking the plate.
"I tried to mix up my pitches so I could keep the hitters off balance," he said. "I worked on my splitter more. Hopefully all those tools will help."
In eight relief appearances with Reno, Shaw surrendered two runs in eight innings while striking out 10.
"Giving up 10 runs like I did kicks you in the butt a bit, so going down and having good results definitely helped my confidence," Shaw said. "It's always good to be back here."
Zagurski had a 6.18 ERA in 32 games this season. He was claimed by the D-backs off waivers from the Phillies on Sept. 22, 2011.