Huston Street hit the disabled list, and there's not a clear cut replacement:

Athletics placed RHP Huston Street on the 15-day disabled list, retroactive to May 13, with an irritation in his right ulnar nerve. It was thought that an A's reliever might go on the DL today, but there was no indication it'd be Street. Under normal circumstances, Justin Duchscherer would fill in as the team's closer. However, he might be day-to-day for the foreseeable future because of his hip. Kiko Calero is likely next in line for save opportunities, though he's been a disappointment so far this year. Alan Embree could also be an option when lefties are due up in the ninth. Duchscherer is probably the best bet of the group at the moment.

It's a good time to start winning blowouts.