LOS ANGELES -- The Dodgers go into their first series against their bitterest rivals riding Hyun-Jin Ryu's new curveball, Matt Kemp's uncertain ankle and their pitching rotation's biggest mystery.The Dodgers were hesitant to use ace Clayton Kershaw three times in their first six games, an opportunity that arose because of the team's opening series in Australia. They didn't want to pile up too many innings on Kershaw too soon.But now Kershaw is on the disabled list and Ryu, who has started his season with 12 scoreless innings, will get the opportunity Kershaw couldn't.