Marc Leishman leads the BMW Championship at Conway Farms, Chicago.
Marc Leishman leads the BMW Championship at Conway Farms, Chicago. Charles Rex Arbogast

Leishman determined not to make same mistakes

AUSTRALIAN Marc Leishman says he has learned from his defeat at TPC Boston two weeks ago as he searches for his third PGA Tour success at the BMW Championship in Chicago.

Leishman took a five-shot lead over fellow Aussie Jason Day and American Rickie Fowler into the final round at Conway Farms after a third round three-under-par 68 left him on -19under.

A victory at the penultimate FedEx Cup play-offs will put the Victorian in a great spot to win the FedEx Cup and the $10m bonus which goes with it.

Leishman said dropping five shots on the back nine at TPC Boston, handing American world No.4 Justin Thomas his fifth Tour win of the season, was a bitter pill to swallow.

"I usually say to my wife, if I have a bad round, give me 10 minutes and I'll be OK. (Boston) took a day. It stung a bit," he said.

"Even though I had Jordan Spieth and Justin Thomas on my tail, when you're leading it's hard to get overtaken on the back-nine. I'll be doing my very best not to happen again."

Of the 13 times a player has held a 54-hole lead of five shots or more during the past five years, 11 have gone on to win.

Day, who played in the final group with Leishman in round three, said beating his in-form compatriot was going to be a tough task.

"Leish is playing spectacular; he's going to be very difficult to beat tomorrow," said Day, who went wire-to-wire during his 2015 BMW Championship win.

"I've got to come out and play really good golf because he's not making any mistakes.

"He's hitting it in the right spots on the greens and holing putts. That's a good formula for success."

Rounding out the Australian contingent on the leaderboard is Brisbane's Cameron Smith, who carded a 69 to move to 10-under and be in a tie for 12th.

The 24-year-old needs at least a fourth-placed finish to advance to next week's 30-man Tour Championship.