Serena Williams of the U.S. returns the ball as she and Czech Republic's Karolina Muchova play during their round of 16 doubles match against New Zealand's Erin Routliffe and Mexico's Giuliana Olmo during the WTA 500 Berlin Open tennis tournament at Steffi Graf Stadium, in Berlin, Germany, Tuesday, June 16, 2026. (AP Photo/Ebrahim Noroozi)