(CNN) When it comes to her health this year, Serena Williams just can't catch a break.

Williams rolled her left ankle holding a match point against Karolina Pliskova at the Australian Open in January and ended up relinquishing a 5-1 advantage in the third set of their quarterfinal.

Then came illness in Indian Wells in March, a troublesome -- and lingering -- knee injury and back spasms in Toronto last month that forced her to retire in the final against one of 2019's breakout tennis stars, Bianca Andreescu.

If all that wasn't enough, Williams rolled her right ankle at the US Open Sunday against 22nd-seed Petra Martic.

It came at 2-2 in the second set after Williams just hit a volley at the net.

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