(AP Photo/Al Behrman)

MASON, Ohio (AP) Andy Murray needed three sets in the afternoon heat and more than a little help in the tiebreaker to avoid a huge upset.

His scream after the final shot? The sound of survival more than celebration.

The fourth-ranked player was worn down and off his game Thursday, but managed to take advantage of Ernests Gulbis' erratic shots - especially in the tiebreaker - for a 6-4, 3-6, 7-6 (4) victory that sent him into the quarterfinals of the Cincinnati Masters.

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