Petra Kvitova edges Garbiñe Muguruza in third-set tiebreaker

Petra Kvitova erased a pair of match points and converted

 edge Garbiñe Muguruza 5-7, 6-3, 7-6 (10) 

Saturday in a showdown between two-time major champions.

Kvitova just kept coming back -- after dropping the first set

trailing 5-2 in the third and after being a point

defeat twice at 6-5 -- to advance to the fourth round

the US Open. No. 21 Kvitova on Monday will face No. 8 Jessica Pegula,