Turnesa, who shared the lead after the first and second rounds, completed 54 holes at 21-under 195, one shot off the tournament's 54-hole scoring record. He will go for his first PGA Tour win on Sunday.
Matt Kuchar (71), who shared the second-round lead with Turnesa shares fifth place at 197 with former Masters champion Zach Johnson (70) and Chris Stroud (67).
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