Hallberg turns on style
The 54-year-old recovered from an early bogey on the Ailsa course to put in a superb burst of eight birdies in 13 holes on his way to a seven-under 63.
It left him clear of first-round leader Bernhard Langer and American Tom Lehman. Langer played steady golf in the windy conditions to reach the turn in par and went on to birdie the 11th. But a disastrous triple-bogey seven at the 13th, followed by another bogey at the 17th saw him slump to a round of 73.