Alexi Amarista, getting a start for Chase Headley at third base, hit ninth.
Black explained that since Roach, normally a long reliever, was only likely to throw 60 or so pitches, having him hit eighth created the possibility where the Padres could pinch-hit for him one batter or one inning sooner, depending on the situation.
"With Roach going three [innings] or so, and it depends on pitch-count, that spot will come up before the ninth spot," Black said. "With a short starter, you're able to use a pinch-hitter sooner."
This isn't the first time Black has done this.
During a three-game series against the A's on June 19-21, 2009, starting pitchers Kevin Correia, Walter Silva and Wade LeBlanc also hit eighth. The No. 9 hitter in that series was Everth Cabrera, who hit in the leadoff spot Sunday.
The Padres' bench sets up pretty well for Sunday, especially with Headley available to pinch-hit if it's needed.
Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.