Fox Sports Ken Rosenthal has written an article that speculates the A's are front-runners for Hisashi Iwakuma. A snip:
At first glance, the A's would seem an unlikely suitor for Iwakuma; the team led the American League in rotation ERA by a wide margin last season, and none of their returning five starting pitchers is older than 27.
However, the A's have struggled to attract free-agent hitters to Oakland in recent years. The addition of Iwakuma would enable them to trade a starter such as righty Vin Mazzaro -- or perhaps even Iwakuma himself -- for a bat.
The article also mentions that the A's, Rangers, and Mariners were amongst the teams that submitted bids for Iwakuma.