McIlroy leads at halfway at USPGA

Rory McIlroy

Rory McIlroy's bid to win back-to-back golf majors is still on course after to taking the lead at the US PGA Championship.

The world number one is 9 under par, a shot ahead of Jason Day and Jim Furyk.

Torrential rain disrupted early rounds at Valhalla, and McIlroy told Sky Sports News the conditions made things difficult.