Hensby, whose promising career was curtailed by a car accident in 2006, birdied three of his last four holes to be a surprise leader.
The former Tamworth NSW resident left for the USA in the mid 1990's and first battled his way onto the PGA Tour for the first time in 2001.
Hensby had his best seasons in 2004 and 2005 when winning the John Deere Classic and the European Tour's Scandinavian Masters and became a member of the Presidents Cup side that same season.
The pair leads by one over Emiliano Grillo, Charlie Beljan and Sam Saunders.
Aaron Baddeley made the cut on the number.
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