Serena Williams has just broken a Grand Slam record

She beat Martina Navratilova's previous all-time best.

Serena Williams broke the women's record for most grand slam singles wins as the American cruised past Johanna Larsson and into the US Open last 16.

Williams took exactly one hour to see off Sweden's Larsson 6-2 6-1 and register her 307th major victory, beating Martina Navratilova's previous all-time best.