The Giants will forgo the DH and have Madison Bumgarner bat in his start in Oakland on Thursday.
Jameson Taillon defeated the Mariners by allowing one run in six innings on Wednesday.
Wade Miley lasted four innings and gave up five runs in a loss to the Pirates on Wednesday.
In his first appearance after being moved to the pen, Nate Karns struck out six in two scoreless innings Wednesday against the Pirates.
Sean Rodriguez doubled twice and knocked in four runs Wednesday against the Mariners.
Starling Marte had three hits, a walk, a steal and three runs scored Wednesday against the Mariners.
Alcides Escobar delivered a go-ahead double in the top of the 12th to help the Royals beat the Cardinals 3-2 on Wednesday.
Edinson Volquez bounced back from last week's debacle against the Astros to hold the Cardinals scoreless for 6 2/3 innings on Wednesday.
Carlos Martinez did not surrender a run in six innings, allowing eight hits and a walk while striking out three batters in a strong no-decision effort versus the Royals on Wednesday.
Working the eighth in a scoreless game, Jonathan Broxton gave up a run on two hits and a walk Wednesday against the Royals.
Kendrys Morales went 3-for-4, all singles, and played in the outfield for the first time since 2008 on Wednesday.
Matt Adams went 0-for-6 with three strikeouts in Wednesday's 12-inning loss to the Royals.
Stephen Piscotty hit a game-tying home run in the bottom of the 10th inning on Wednesday.
Sean Manaea blanked the Giants for 5 2/3 innings in a victory Wednesday.
Jake Peavy was tagged for seven runs -- four earned -- in 3 1/3 innings by the A's on Wednesday.