Rory McIlroy will once again be the world number one golfer when the latest rankings are published later.

Colt Knost was the halfway leader after shooting a five-under-par 66 on the second day of the RBC Heritage in South Carolina.

Paul Casey and Geoff Ogilvy were battling it out for supremacy on the PGA Tour again as the wind-delayed Shell Houston Open played catch up.

One of the leading lights of the Britain and Ireland Walker Cup side failed to shine on the opening day at Royal County Down in Northern Ireland.

The United States held the early advantage when they began the defence of the Walker Cup against Britain and Ireland’s amateurs at Royal County Down in the North today.