The White Sox turned the tide against the hot A's with a late outburst Saturday, and to keep that momentum rolling Sunday they'll need a big fill-in start from swingman Hector Santiago.
The left-hander will step in for an injured Jake Peavy to start the series finale, meeting right-hander A.J. Griffin in the last of a four-game series. The A's have won two of the first three.
Peavy sustained a fractured rib in his start on Tuesday, bringing Santiago to the mound for Sunday's game. The southpaw is 1-2 with a 2.96 ERA in five starts this season, while going 0-2 with a 3.93 ERA in 11 relief appearances.
Since his last start, Santiago is 0-1 with four earned runs allowed in four innings of work in four relief appearances, but he's prepared for the spot start.
"They kind of gave me a heads up when they told me I was going back to the bullpen," Santiago said. "'If a guy could use a spot start, you will be the guy. We won't bring anybody up.' I'm mentally ready for it."
In Griffin, the White Sox will be seeing a big right-hander who was among the Athletics' crop of 2012 rookies and is establishing himself in his second year. This will be his first appearance against the White Sox.
In his last outing, Griffin had a no-decision in Oakland's 4-3 loss in 10 innings at Milwaukee. He allowed just four hits in his seven innings.
Athletics: Doolittle's woes continue
After a rough eighth inning Saturday, reliever Sean Doolittle has given up 10 runs over his last five outings. That, after allowing just two runs over his first 23.
Doolittle allowed all three runs in the decisive eighth inning Saturday. Earlier in the week, manager Bob Melvin was philosophical about the setup man's struggles and gave him a vote of confidence.
"Like any pitcher that's ever pitched, you're never going to be perfect over the course of your entire career, and I think going through something like this gives you experience, makes you better, makes you find out different ways to do it," Melvin said. "He'll be better on the flip side for it."
White Sox: De Aza keeps rolling
After going 1-for-3 and scoring one of the eighth-inning runs on a single by Alex Rios, Alejandro De Aza is hitting .375 (15-40) with six walks, seven RBIs and seven runs scored in his last 10 games to raise his average from .239 to .263.
• Heading into Sunday's game, Paul Konerko is one appearance behind Nellie Fox for the No. 2 spot in games played in a White Sox uniform. Konerko played in No. 2,114 on Saturday. The all-time leader is Luke Appling with 2,422.
• The A's clinched the seven-game season series with Friday night's victory and they are 139-141 at Chicago in a close overall series that stands at 295-271 in favor of Oakland.
• Following Sunday's finale, the A's head home for a three-game series against the Yankees starting Tuesday, while the White Sox will welcome the Blue Jays to town for a three-game series that begins Monday.
John Schlegel is a national reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.