ATLANTA (AP) Vasek Pospisil overcame sweltering heat and cramps to outlast Yen-Hsun Lu in the Atlanta Open on Wednesday.
Pospisil, the No. 2 seed from Canada, beat Taiwan's Lu 6-4, 6-7 (3), 6-4. The match ended on Lu's second double-fault of the match.
The temperature was 95 degrees, with a heat index of 101. Pospisil looked unsteady on his feet after losing the second-set tiebreaker. Cramping in his legs caused him to fall to the court in the third set, but he continued without a delay.
Pospisil will play fifth-seeded Marcos Baghdatis of Cyprus in the quarterfinals Friday. Baghdatis beat Australia's Sam Groth 7-5, 3-6, 6-3.
Top seed and two-time defending champion John Isner will play Radek Stepanek of the Czech Republic on Thursday.