Mariners and Hisashi Iwakuma agree to contract extension

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UPDATE: Jon Heyman of CBSSports.com reports that Iwakuma will get $14 million guaranteed. He’ll make $6.5 million in each of the next two seasons while there’s a $1 million buyout on a $7 million option for 2015.

11:29 PM: Hisashi Iwakuma was hours away from reaching free agency, but the Mariners swooped in at the last minute tonight and signed him to a two-year extension with a club option for 2015. Terms haven’t been disclosed.

As Larry Stone of the Seattle Times points out, there was a sense of urgency to get a deal done today. Per a stipulation in the one-year contract Iwakuma signed last offseason, if he re-signed with the Mariners after Saturday’s deadline, he would be ineligible to play for the club until May 15 of next year.

Iwakuma thrived after getting a chance in the Mariners’ rotation this July, going 9-4 with a 2.65 ERA and a 78/28 K/BB ratio over 95 innings. The 31-year-old right-hander will return to a rotation which is set to include Felix Hernandez and Jason Vargas. Erasmo Ramirez and Blake Beavan are the likely frontrunners for the other two spots.