So, what gives?
"Any time your bullpen absorbs some losses, it means you are losing some close games," manager Bob Melvin said in advance of Sunday's game in Houston. "We're not used to that. Last couple years we've won most of them. We're off to a little bit of a slow start as far as that goes."
The A's are 4-4 in one-run games and 1-4 in two-run games. Last year, they were 30-20 in one-run games.
But the season is still young, and Melvin knows his relief crew remains "a very talented bullpen." Its quality of depth is perhaps unmatched.
"It won't continue this way, in my opinion," Melvin said. "You go through a slump, whether it's offensively, whether it's defensively, and it can happen in that fashion, too, with the bullpen."
This funk may be just that, but there is a major difference in the dynamic of this year's bullpen that has nothing to do with new names. The A's are playing with a closer-by-committee approach, which is good for matchup purposes, but not widely used since most relievers are most comfortable with set roles.
But Melvin noted Sunday that his relievers learn their roles for each game ahead of time.
"It's not like they don't know," he said. "We're pretty communicative on a day-to-day basis. It might not be like it is where you set your roles early in the season and you might not have another discussion because they know exactly what's going on. But we try to be communicative every day to try to combat that.
"If there are certain guys who aren't available on a certain day, we let the others know, OK, this is your inning today, and these are the guys we're looking to set up today, and this is how we're looking to get to the closer spot."
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.