Rookies Brandon Maurer and James Paxton will start on Monday and Tuesday, with Iwakuma finishing off that series. The A's come to Seattle to close out the season Friday through Sunday, but no decision has been made on starters for that set.
"We're just going to wait and see how Felix [Hernandez] goes today," manager Eric Wedge said prior to Sunday's start. "We'll keep a real close eye on him, especially early, to see how he's working."
As for the decision on not shutting Iwakuma down?
"We talked about it," Wedge said. "But in the end, he wants to pitch. He's given us every indication that he's still strong, if you look at his last three or four outings."
Greg Johns is a reporter for MLB.com. Follow him on Twitter @GregJohnsMLB as well as his Mariners Musings blog. This story was not subject to the approval of Major League Baseball or its clubs.