Jason Day holds the half-way lead at the Masters.

The Australian, who was a runner-up in 2011, came through the field last night to post a 4 under par round of 66 that gives him a one shot lead from 6 under.

Fellow Australian Marc Leishman and 1992 champion Fred Couples are just a shot off the pace while Tiger Woods is hovering dangerously on 3 under par after he carded two bogeys in his final four holes last night.

Rory McIlroy is also well placed on 2 under par but the world Number 2 believes that he is yet to rediscover his very best form... 

McIlroy is the only Irishman to have made the weekend field after Graeme McDowell agonisingly finished just outside the cut on 5 over.

Padraig Harrington slumped to a second round 75 saw him finish on 9 over par, while Alan Dunbar was 16 over.

However, 14-year-old Guan Tianlang of China has become the youngest player to survive the cut at the Masters after reaching the half-way stage on 4-over par.