No. 5 Stanford men’s water polo (20-3, 0-2 MPSF) faced another defeat this past Sunday, losing to No. 3 USC (15-5, 1-1 MPSF) 19-14, the widest losing margin for the Cardinal thus far this season. Stanford started strong with the first goal scored by junior driver Jackson Painter, converting a penalty committed by USC. The Trojans quickly recovered two minutes after with their own goal…