Five questions with Serena foil Roberta Vinci before the US Open

Then-ranked No. 42, Roberta Vinci stunned the world when she upset Serena Williams in the semifinals of the 2015 US Open and ended Williams' quest for the elusive calendar Grand Slam. Vinci lost to fellow Italian Flavia Pennetta in the final, but she proved herself to be a top singles player during her time in Flushing Meadows.