Charley Hull birdied three of her final six holes to get within three strokes of the early lead at the Omega Dubai Ladies Classic.
The Englishwoman's fast finish helped her match playing partner Georgia Hall's opening-round 70 and stay in touch with early pacesetter Supamas Sangchan.
Sangchan fired a bogey-free 67 to set the morning clubhouse target at five under, with Scotland's Kelsey MacDonald one of five players a shot off the pace.
Beginning on the back nine, Sangchan - a winner on the Ladies European Tour last season - picked up a shot at the par-four 17th and added four birdies in a six-hole stretch from the first to top the leaderboard.
A final-hole birdie lifted MacDonald into the share of second alongside Nanna Koerstz Madsen, Celina Yuan and Finnish pair Minea Blomqvist and Noora Tamminen.
Florentyna Parker recovered from an opening bogey to post four birdies and join fellow Englishwomen Sophie Walker and Dame Laura Davies two off the pace, with Order of Merit champion Hall a further stroke back after mixing three birdies with a sole blemish.
Watch the Omega Dubai Ladies Classic throughout the week live on Sky Sports. Live coverage continues on Thursday from 10.30am on Sky Sports Golf and Sky Sports Main Event.