Venus, Azarenka march into Miami quarter-finals

Mar 26, 2018; Key Biscayne, FL, USA; Venus Williams of the United States hits a backhand against Johanna Konta of Great Britain (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Williams won 5-7, 6-1, 6-2. Geoff Burke-USA TODAY Sports

(Reuters) - Venus Williams upended defending champion Johanna Konta 5-7 6-1 6-2 on Monday to reach the Miami Open quarter-finals while a dominant Victoria Azarenka also advanced with a straightforward win over Agnieszka Radwanska.

Three-times champion Williams stormed back from an early deficit to cruise past the British 11th seed, who needed several bouts of treatment on her lower back throughout a match that lasted two hours and 19 minutes.