The D'Backs have designated Saul Rivera for assignment to make room for Blaine Boyer, according to the team. The D'Backs acquired Rivera from the Nationals for cash last month, but the right-hander wasn't the solution to Arizona's bullpen woes. Rivera, 32, appeared in four games for the D'Backs and allowed 11 hits and three walks in 3.2 innings, with one strikeout.
As a group, D'Backs relievers have a 7.19 ERA, so the team continues looking for bullpen arms. Boyer, 29 next month, was part of the problem for manager A.J. Hinch early in the season, when he posted a 7.82 ERA in 14 appearances. But the right-hander returned to the minors and pitched well. Boyer walked one and allowed five hits in six innings, striking out nine.