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Iga Swiatek has withdrawn from the Madrid Open due to a right shoulder injury, the World No. 1 announced Wednesday via social media.

The Polish star told her followers on Twitter that she would miss the Madrid Open, which kicked off its qualifying matches Tuesday, citing a tired arm.

“After intense last weeks and winning four titles in a row it’s time to take care of my arm that has been fatigued since the Miami Open and I haven’t had a chance to handle it properly,” Swiatek wrote. “I need a break from playing so intensively in order to treat my arm well and that’s why, unfortunately, I have to withdraw from the Mutua Madrid Open. My body needs rest.”

Swiatek has had a stellar start to the year, notching 23 straight wins to clinch four straight titles, including the Stuttgart Open, Indian Wells, Miami Open and Qatar Open.

Round of 64 play begins in Madrid on Thursday, with No. 4 Maria Sakkari and American Madison Keys headlining the first-round matchups.