Serena Williams advances to the round of 32 by holding off a 17-year-old who wasn't born when Williams won her first US Open, in 1999.
US Open: Serena Williams survives upstart American Caty McNally in three sets
Serena Williams advances to the round of 32 by holding off a 17-year-old who wasn't born when Williams won her first US Open, in 1999.
