Haren, 8-4 through June, has lost all four starts in July while allowing 20 earned runs in 19 innings. He also has allowed runs in the first or second inning in 15 of his last 16 starts.
Ryu will be pitching on five days' rest. In his two Major League seasons, Ryu's ERA is 2.80 on five days' rest, 2.59 on more than five, but 3.68 on four days' rest.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.