"It does matter, most definitely," Wedge said. "I was talking about that on the drive in today. We need to take this one. At some point in time these guys need to start finishing things off. It most definitely matters, especially when you're trying to gain ground."
Oakland, one of baseball's hottest teams heading into the series with Seattle, hasn't suffered a sweep at home since April.
The A's (41-29) entered Friday's series opener on an 11-game win streak at home and owners of the best 26-game stretch in the Majors this year at 21-5. A win Sunday would put the Mariners (31-38) 8 1/2 games back of the first-place A's in the American League West.