Serina Williams overcame her right ankle to advance to the quarterfinals of the US Open.
Williams, busy eighth, was injured in the middle of the second set against Petra Martic, but managed to finish 6-3, 6-4 in 1 hour, 32 minutes.
Next up for Williams is Wang Qiang, who knocked off No. 2 seed Ash Barty in straight sets earlier on Sunday.
Sunday's victory comes on the second birthday of her daughter Alexis Olympia Ohanian Jr., who Williams posted on Instagram earlier in the day.
Williams, who has won 23 Grand Slam titles, has been looking for her elusive first tournament win of all kinds since stepping down from tennis in 2017 for the birth of her daughter.