MIAMI, FL, USA – Victoria Azarenka survived a late wobble to defeat No.4 seed Garbiñe Muguruza and keep alive her hopes of becoming the first player in a decade to complete the Indian Wells-Miami double.

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No one since Kim Clijsters in 2005 has managed to win the two Premier Mandatory events in the same year and Azarenka weathered a barrage of winners from Muguruza to prevail, 7-6(6), 7-6(4), and book a quarterfinal spot.

“I think it was a high-quality match for both of us. It was a lot of good striking, a lot of winners, and both of us taking opportunities,” Azarenka said. “I think today I served really well, and I played to win in important moments. Momentum shifting, I think I was a little better today.”

Azarenka has started the year like a freight train, claiming titles in Brisbane and Indian Wells and winning 19 of 20 matches. Sandwiched between her triumphs in Australia and California was the sole setback, defeat to an inspired Angelique Kerber in the Australian Open quarterfinals.

This disappointment only seems to have fuelled the fire in the Belarusian and in a contest of fine margins and superlative shotmaking against Muguruza it was her game that stood firm at the pivotal moments.

Azarenka, who lifted the Miami Open in 2009 and 2011, produced an ace and a brilliant return to recover from 6-4 down in the first set tie-break and then forged 5-2 ahead in the second. Muguruza, though, went down all guns blazing, drawing level amidst a barrage of winners only to succumb in another tie-break.

In the last eight, Azarenka will face Johanna Konta, a 6-2, 6-2 winner earlier in the day over Monica Niculescu.

A leg injury to Azarenka cut short the only previous meeting between the two in Wuhan last autumn, since when the Briton has established herself at the top of the game.

“We have played in Wuhan last year, but it was difficult to consider that a full match since I didn’t really feel physically well or wasn’t good on the court,” Azarenka said. “But it’s really impressive to see how much she improved over the last couple months. Obviously had some great results; playing with a lot of confidence.

“She has a very solid game; big serve. I’m just looking forward to that challenge.”

Fantastic quality between Azarenka-Muguruza. The stats, as great as they are, don’t even capture it. pic.twitter.com/INJzhMOrMS

— WTA Insider (@WTA_insider) March 28, 2016