Zach Murray

Second-round leader Zach Murray, a 17-year-old from the suburbs of Melbourne, posted five-under 67 to extend his one-shot lead to two with 18 holes to play. Murray's playing parter and fellow teenager, Frazer Droop, carded his second straight round of 68 and sits two back of Murray in search of the green jacket.

The prize of the day, however, went to Sydney native Cameron Davis, a Golf Australia national squad member, who joined Tom Crow by tying the course record at 63. The round jumped him from five-over to four-under, putting him in a tie for eighth place and seven shots back. Remarkably, Davis's lone bogey came on a short par-five, the fourth.

Jake McLeod and first-round leader Ben Eccles share third place, with Eccles bouncing back from a 74 in the second round to post 68 on Thursday. McLeod went low in round three with a 66 to hop into the top-three.

With Aussies dominating the top-six, American Bryson DeChambeau of Clovis, Calif. comes in at seventh place despite an opening-round 74. Since the two-over start, the Southern Methodist University golfer and winner of the 2013 Trans-Miss Amateur strung together a 70 and 66 in the two rounds since as he sits five shots back entering Friday.

One other notable American in the top-10 is Will Zalatoris of Plano, Texas, who in 2014 won the U.S. Junior Amateur, Trans-Miss, and Texas Amateur. Zalatoris will look to build on rounds of 71-72-69 in the first three rounds in order to make a seven-shot comeback.

The final round concludes Friday at Royal Melbourne Golf Club. For live tweeting of the event, be sure to tune in on Twitter to @GolfAust, as well as live scoring below.