Lawrie, who shot a 70, cracked the face of his driver in practice and had to press a new one into action.
“On the seventh tee my tee shot made a bit of a funny noise and on inspection I noticed my driver face had cracked,” he reported.
“(My caddie) headed off at the ninth to find a replacement from one of the TaylorMade reps. I eventually found one that I like. It’s a pity as I had found one that I really felt good with but the new one also felt great today.”
On-form Drysdale also opened with a two-under effort but Ramsay was top Scot after he signed for a 69.
Colin Montgomerie (71) and Stephen Gallacher (72) are also in the top 40, while Scott Jamieson and Peter Whiteford shot 73s. Marc Warren opened with a 75, while George Murray had a 76.