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Caroline Wozniacki advances to quarterfinals when Garbine Muguruza retires with illness

KEY BISCAYNE, Fla. -- Caroline Wozniacki has reached the quarterfinals of the Miami Open, advancing Monday when Garbine Muguruza retired after one set with a heat-related illness.

Wozniacki, the sixth seed, took that set over the 12th-seeded Muguruza 7-6.

Muguruza was tended to by doctors following that tiebreaker, which wrapped up a 70-minute set, and decided she could not continue on a 77-degree, humid afternoon.

Wozniacki still has not dropped a set in the tournament, and will face fourth-seeded Dominika Cibulkova or Lucie Safarova in the quarterfinals.

Earlier Monday, Karolina Pliskova also reached the quarterfinals, beating Czech Fed Cup teammate -- and occasional doubles partner -- Barbora Strycova 6-1, 6-4. Pliskova needed only 21 minutes to take the first set, winning 11 consecutive points in one stretch and 16 of 17 on her serve.