Former A's first-round draft pick Nick Swisher, and his wife JoAnna, recently welcomed their second daughter, Sailor Stevie.
The A's American League-record 20-game winning streak is safe.
The Cleveland Indians, winners of 14 in a row entering play Saturday, lost to the Toronto Blue Jays 9-6.
With the D'backs tossing lefty Patrick Corbin on the hill, Giants manager Bruce Bochy has turned to Ruben Tejada to play third base.
San Francisco Giants (51-31)
Bryce Harper had two hits in Friday night's Nationals win over the Reds, but on his second he probably could have had more than a single.
The A's on Saturday are looking to snap a losing streak and get on the board against the Pirates.
Manager Bob Melvin has set his lineup for the game.