Ana Konjuh News
Williams becomes the oldest player since then 37-year-old Martina Navratilova in 1994 to reach the quarter-finals, where she will face the brightest of the sport`s next-generation stars, French Open champion Jelena Ostapenko.
Konjuh, 19, dominated from the start and Azarenka had no answer to the depth and power of her opponent.
The 29-year-old will first have to get by Elina Svitolina, on course for her own breakthrough into a first-time top 10 ranking if she can win the event.
The top seeded German, who held the top WTA spot in 2016 before Serena Williams took back in September could regain the number one ranking if she wins the Gulf event on Saturday.
Fourth-ranked Halep crashed out of last month`s Australian Open in the first round.
At 1.57 metres (5ft 2in), Davis is one of the smallest players but she more than compensated for her lack of height with her speed around the court.
Pliskova will face either Serena Williams or Romanian Simona Halep for a place in Saturday`s championship match.
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