Serena Williams proud to equal Martina Navratilova record

Serena Williams reflected on a "cool milestone" after equalling Martina Navratilova's Open-era record for grand slam women's singles wins.

Williams moved level with Navratilova's 306 major tournament victories by easing past fellow American Vania King 6-3 6-3 in the second round at Flushing Meadows.