The games will be played March 22-23 at Sydney Cricket Ground.
Kershaw will be making his fourth straight season-opening start for Los Angeles.
Manager Don Mattingly made the announcement Sunday after weeks of speculation about who would start in Australia.
Ryu got the start in Game 2 because of an injury to Zack Greinke, who strained his right calf while throwing four pitches in his only spring appearance on Feb. 27 against Arizona.
Before getting hurt, Greinke said there was ''zero interest'' in making the long trip. He is not expected to travel.
Greinke was scheduled to throw a bullpen session Monday.