To make room on the 40-man roster for Rodriguez and Kontos, Pittsburgh designated outfielder Danny Ortiz and reliever Jhan Marinez for assignment. Kontos is effectively replacing Marinez in the Bucs' bullpen.
Claimed off waivers from the Brewers on May 19, Marinez pitched well in a low-leverage role for the Pirates. The right-hander recorded a 3.18 ERA and 1.35 WHIP in 34 innings over 24 appearances.
Kontos, 32, has posted a 3.83 ERA and 1.34 WHIP in 50 appearances for the Giants this season. He owns a 3.05 ERA in 300 games for San Francisco.