Flavia Pennetta was one of the stunning success stories from the 2013 US Open. The Italian entered Flushing Meadows ranked No. 83 in the world before upsetting, in order, No. 4 seed Sara Errani, 2004 champion Svetlana Kuznetsova, red-hot No. 21 Simona Halep and No. 10 Roberta Vinci to reach the semifinals.