Serena Williams on Sunday defied ankle injury to advance to the quarter-finals stage of the 2019 US Open.
The 23 Grand Slam singles titles holder needed a medical time out in the second set of her 6-3 6-4 win over Petra Martic on Sunday to get treatment on her right ankle.
Williams, however, recovered to win and advance to the next stage of the U.S. Open.
She fell to the court at 2-2 in the second set after charging to the net to hit a volley that sailed long.
The 37-year-old American eighth seed got treatment on her ankle during the changeover and appeared to be fine, smacking 38 winners on a sunny day at Arthur Ashe Stadium court.
Williams blasted her fourth ace on match point to see off 28-year-old Croatian Martic and reach the last eight, where she will face Wang Qiang of China for the first time.