Pomeranz has not allowed an earned run in 10 appearances this season with Triple-A Norfolk (five games, 10 innings) and Double-A Bowie (five games, 13 1/3 innings). He pitched more than one inning in nine of 10 appearances, striking out 35 and walking three. The right-hander made two scoreless appearances for the Orioles earlier this season after having his contract selected on May 7 and was victim to a roster crunch that led to him being sent down.
Orioles manager Buck Showalter said the club basically had Pomeranz's eligibility date circled on the calendar, and he was recalled for the team's first game after a 10-day stay in the Minors, the minimum non-injury period.
"[We] wanted to add the arm, keep the integrity of our bullpen itself as much as possible," Showalter said of a relief corps that entered Friday with a 2.31 ERA, the second-best mark in the Majors.
"The idea was to get Ronny back at some point, [he] went down there and played real well. I would like to see Expo get catching five or six days a week [for Norfolk]. He's still a very young man. [Hopefully he can] get his bat going a little bit."
Paulino batted .300 (9-30) with three RBIs in nine games for the Orioles earlier this season and hit 283/.313/.391 in 12 games for Norfolk after being optioned on May 7.
Exposito, who was recalled from the Tides on May 4, struggled at the plate going 1-for-17 (.059) in eight games for the Orioles.
Hall, who had his contract selected on May 12, batted .286 (2-7) with a solo home run, becoming the 22nd Oriole in franchise history to hit a home run in his first game with the club.