Poland's Iga Swiatek serves the ball to Belarus' Aryna Sabalenka during the 2021 WTA Finals Tournament women's singles match in Zapopan, Mexico, November 13, 2021. - The WTA Tennis Tournament finals, which were originally to be held in China, bagan Wednesday in Zapopan due to the Covid-19 pandemic. (Photo by Ulises Ruiz / AFP)