Anirban Lahiri at tied-35 at halfway stage of BMW Championship

PHOTOS: BMW Championship

Fellow Australian Jason Day and American Rickie Fowler both shot 70 to share second place on 14-under, with Englishman Justin Rose (66) alone on 12-under.

Spieth heads the FedExCup standings -- and the race for the $US10 million ($F20m) bonus awarded to the overall season champion -- with only next week's Tour Championship in Atlanta remaining after this week.

"I usually say to my wife, if I have a bad round, give me 10 minutes and I'll be OK". "That one probably took a day".

"Putting four good rounds together (is the biggest challenge)" Leishman said, according to CBSSports.com. "Hopefully I can just play well, do the right things and not worry about the result too much, as hard as that will be".

Day was just two-under for the day heading to the par-five 14th, but chipped in for eagle to ignite what would prove to be a stunning finish.

McIlroy won the Tour Championship previous year to scoop the lucrative FedEx Cup bonus, but world number two Jordan Spieth leads the rankings.

"I've been really close timing-wise, really close to hitting really good shots", Rahm said.

Jason Day and Marc Leishman shake hands on the 18th.

"I'm in a fortunate position, being able to not only impact one person but be able to impact another person's life", Day said.

"Bit of a grind out there today", acknowledged Day, who won the tournament in 2015.

"Yeah, I can't wait to get out there for these last two rounds". He hit a sudden dip in form, a summer swoon that saw him miss cuts and/or fail to contend in the majors, and now he's back again, playing some of his best golf of the year from tee to green. "That's a good formula for success, and it's going to be tough".

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.

Now sixth in the world rankings, he needs a top-four finish at Conway Farms to get there.

Ranked 51st in the FedEx Cup standings before the tournament got underway in IL - with the top 30 players progressing to the season-ending Tour Championship - McIlroy is facing a mountain to climb following Friday's second-round 69, which left him 15 shots behind leader Marc Leishman.

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