Schumaker supplied run-scoring singles in the fifth and seventh innings added an RBI on a fielder's choice for Los Angeles, which took its first victory in May.
Ryu (4-2) yielded one run on five hits over 6 2/3 frames, walking three and striking out three.
Marlins starter Kevin Slowey (1-3) was touched for five runs on 11 hits in a 4 2/3-inning effort.
Miguel Olivo hit a bases-empty homer for Miami.
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