Braves' right-hander Randall Delgado will be looking to pitch deep into Sunday's game to rest a bullpen that had to throw 5 1/3 innings on Saturday in support of injured starter Brandon Beachy.
That has been easier said than done for Delgado, a 22-year-old who has completed six innings only three times in 12 starts this season.
Delgado last pitched against the Yankees on Monday, allowing three runs on five hits and a career-high six walks in only five innings.
"Sometimes I gave them too much credit with the strike zone," Delgado said following the start. "I was trying to be perfect on the corner, and I think that was the problem."
Orioles' lefty Wei-Yin Chen has been a pleasant surprise in his rookie season, using superb fastball command to start the year 6-2 with a 3.68 ERA.
After an impressive start, Chen has been looking more hittable of late. He posted an ERA of 2.22 in four April starts but has pitched to a 4.41 ERA since, including giving up four runs on eight hits and two walks in 6 1/3 innings against the Pirates on Tuesday.
Sunday he will attempt to follow in Hammel's footsteps and get back to early-season form.
Orioles: Pearce making early impact
In nine games as an Oriole, Steve Pearce is 10-for-31 with a home run and nine RBIs.
Pearce was acquired from the Yankees for cash considerations on June 2 and has been a fixture in the lineup with regular outfielders Nick Markakis, Nolan Reimold and Endy Chavez all on the disabled list.
Brian Roberts is 7-for-22 since returning to the lineup June 12 after missing more than a year due to concussion symptoms.
Braves: Beachy's elbow forces early exit
Brandon Beachy retired the first 11 batters he faced in Saturday's start before walking Chris Davis and promptly exiting with a sore right elbow.
Beachy's start was pushed from Wednesday to Saturday to rest the sore elbow, but he managed only 57 pitches before he was forced to leave.
Eric Hinske has only four hits in the 43 days since going 4-for-6 against Colorado on May 4. He is 4-for-54 during that span.
The Orioles are 123-152 all-time in Interleague Play, including 54-82 on the road. The Braves are 133-116 all-time and 66-64 at home.