Answer:
Harry wins the lawsuit for fraud.
Explanation:
Before Draco buys the elder wand, Harry states that he is not sure if that is the real elder wand, he thinks it is because Dumbledore said it was, but he is not sure if it is. Harry did not mislead Draco about the elder wand, so Draco cannot accuse Harry of fraud, but if Draco accuses Harry of fraud, Harry will probably win the lawsuit because he warned Draco that the wand could be fake.