Argentina's Miguel Angel Carballo shot a 1-under 71 on Saturday to take a two-stroke lead in the Moonah Classic.
Carballo, tied for the lead after the second round, had 9-under 207 total for three rounds on the Peter Thomson-designed Moonah Links layout.
Australia's Richie Gallichan was second after a 70 in the event sanctioned by the Australasian and Nationwide tours. New Zealand's David Smail (71) and Australia's veteran Peter O'Malley (72) were three strokes back at 6 under.
The best round of the day was a 68 by Craig Spence of Australia, which left him tied for ninth, five strokes off the lead. Australia's Michael Sim, tied for the lead entering the round, also was 4 under after a 76.
Carballo said his switch to a longer putter in November was paying dividends.
"It's all in the putting," he said through an interpreter. "I didn't putt as well as I wanted to last year and if you can't putt well, you can't compete as well.
"I've got a longer putter now and I grip it differently and it just feels comfortable."
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