'It was pretty windy out there today. I'm used to it; this is the kind of wind I grew up with. But I don't play in weather like this now when I'm home. I'm too spoiled,' Catriona said after her round.
Matthew opened with a 5-under 67 taking the outright lead early in the day. Five birdies, two bogeys and a spectacular eagle on the 459-yard par 5 17th gave Matthew the edge she needed to claim the lead.
Catriona hit her 3-wood on the 17th to within five feet of the pin and sunk her putt to drop from 69 to 67.
'I was looking at level par on a day like that,' Matthews said. 'I guess I got lucky.'
Less than ten competitors posted scores of par or better. Among the luck few is Matthew's fellow countrywoman Mhairi McKay who carded 1-under-par 71.
Others tried to catch the 7-year veteran to no avail.
Hee-Won Han and Vicki Goetze-Ackerman faired better than most posting a 3-under 69 and 2-under 70 respectively.
Annika Sorenstam and Grace Park both finished at 2-over-par 74 while Karrie Webb carded three birdies as well as six bogeys and a double bogey leaving herself with, perhaps, too much ground to make up tomorrow at 5-over 77.
Defending champion Betsy King finished at 3-over 75 after carding four bogeys and one lone birdie on the par 3 5th.
Play was suspended due to darkness on Thursday. 11 players will finish their first round at 7:15 a.m. on Friday.