Coming to Arizona are right-hander Yhency Brazoban and left-hander Alberto Castillo, while right-handers Esmerling Vasquez and Bryan Shaw head to Reno.
"The biggie is that we wanted to get a second left-hander, for sure," D-backs manager Kirk Gibson said. "I've been talking about this portion of the bullpen, so [general manager] Kevin [Towers] thought that this [was] the direction we needed to go in. So we'll see how it works out."
Both pitchers were signed as Minor League free agents earlier this month.
Brazoban has not pitched in the Major Leagues since 2008 with the Dodgers. He had a 2.70 ERA with 11 strikeouts in 10 innings at Reno.
- 131 wins
- 121 wins
"He's got experience in a lot of situations," Gibson said. "Good velocity, and throws strikes."
He has a career 4.70 ERA in parts of five Major League seasons.
"I feel pretty happy about coming back to the big leagues," Brazoban said. "I'm going to do whatever I can to help the team."
The 35-year-old Castillo pitched parts of three seasons with the Orioles, and recorded a 4.15 ERA. He posted a 1.50 ERA, with nine strikeouts and three walks, in three games with Reno.
"I came here to do my job, and I'll be ready any time they need me," Castillo said. "That's what I'm here for."