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Barty confirmed she would take herself off the WTA rankings, which will be updated after the Miami Open finishes this weekend.
Fritz upset Nadel 6-3, 7-6 (5) on Sunday to win the BNP Paribas Open and snap the 21-time major champion's 20-match winning streak this year.
Swiatek reached her first Indian Wells final after overpowering former champion Simona Halep 7-6(6), 6-4.
Zhang rebounded after dropping the first set and fought back from a break down on two occasions in the final set to turn back the Ukrainian wild card.
Zverev kicked out of the ATP 500 event in Acapulco after he smashed his racket repeatedly against the umpire's chair after a doubles defeat.
Svitolina had initially refused to play her opening match against Potapova at the Monterrey Open but went ahead after tennis authorities decided to ban Russian and Belarusian players from competing under the name and flag of their countries.
Ukrainian women's tennis players including Marta Kostyuk and Lesia Tsurenko called on the WTA to pull all tournaments from Russia following the invasion of Ukraine.
The 28-year-old beat Marie Bouzkova of the Czech Republic 7-5, 1-6, 6-2 to win the Abierto Akron Zapopan in Guadalajara, Mexico.
The world No. 15 told Eurosport her family and friends in Ukraine were defending the country and that she wanted to help.
Ostapenko outplayed Veronika Kudermetova of Russia 6-0, 6-4 for her fifth career crown.
Results 71-80 of 175
