Jason Day has stormed into a tie atop the leaderboard midway through the second day at the US PGA Tour's Memorial tournament in Ohio.
Former world No.1 Day fired a second consecutive round of four-under-par 68 to climb to eight under and he sits alongside Japanese ace Hideki Matsuyama (71) and American duo JB Holmes (66) and Wesley Bryan (68) in a share of the clubhouse lead at Muirfield Village near Columbus.
Day equalled his best 36-hole score at the Jack Nicklaus-hosted Memorial, which is considered a home event for Day given he lives in Columbus and is a Muirfield Village member.
But 12-time US Tour winner Day has struggled at Memorial, with only one top-25 result in nine previous appearances.
Also in a share of the lead but still out on course is Abraham Ancer (four holes).
A shot back of the lead at seven under is former amateur world No.1 Joaquin Niemann, who will get his round underway in the afternoon.
Next best of the Australians is John Senden, who iced a 69 with a stunning approach to four feet which he converted for birdie at the difficult par-4 18th.
After an opening 73, Senden now sits at two-under the card, while Adam Scott remains at even par early in his round.
Cameron Davis is also at even par and will get his second round underway in the afternoon groups which include fellow Australian Rod Pampling (one over) and Marc Leishman (two over).
Rounding out the Australian contingent is Cameron Smith, whose 72 left him at three over and is likely to miss the cut.
Tiger Woods opened with a bogey and the five-time Memorial winner sits at one over.