British number one Katie Boulter is out of the Miami Open after a fourth-round defeat by Victoria Azarenka of Belarus.
The 27-year-old, ranked 30th in the world, lost 7-5 6-1.
World number one Iga Swiatek is also out after a 6-4 6-2 defeat by 14th seed Ekaterina Alexandrova of Russia.
American world number three Coco Gauff was stunned by French 23rd seed Caroline Garcia, who reached the last eight in Miami for the first time with a 6-3 1-6 6-2 victory.
Two-time Grand Slam champion Azarenka, 34, will play Yulia Putintseva of Kazakhstan in the quarter-finals.
Garcia, who beat four-time Grand Slam champion Naomi Osaka in the previous round, will play American Danielle Collins for a place in the semi-finals.
Collins beat Romania’s Sorana Cirstea 6-3 6-2 to progress to the last eight.
Elsewhere, Kazakhstan’s world number four Elena Rybakina progressed with a 6-3 7-5 win over American Madison Keys to set up a meeting with Greek eighth seed Maria Sakkari.
Sakkari moved in to the quarter-finals with a walkover after Russian opponent Anna Kalinskaya withdrew.
America fifth-seed Jessica Pegula progressed to the last eight with a 7-6 6-3 win over Emma Navarro and will face Alexandrova.
