Pace made a 6-foot birdie putt on the par-5 18th to finish at 16-under 200 at Jian Lake Blue Bay.
Masson birdied the final three holes for a 67.
Michelle Wie and Jessica Korda tied for third at 11 under.
Wie finished with a 70. She tied for fifth last week in South Korea in her first start since withdrawing from the Evian Championship in September after reinjuring her right hand.
Korda, tied for the second-round lead with Pace, closed with a 72.
Rain delayed play for nearly four hours Sunday with the leaders halfway through the round, leading to the Monday finish in the tournament cut from 72 to 54 holes after play was washed out Friday. The start Monday also was delayed by showers.
The tournament was the fourth stop on the six-event Asian Swing. The LPGA Taiwan Championship is next week, followed by the Mizuno Classic in Japan.
Leading final round scores
200 – Lee-Anne Pace (RSA) 67-66-67
203 – Caroline Masson (GER) 67-69-67
205 – Michelle Wie (USA) 67-68-70, Jessica Korda (USA) 66-67-72
206 – Danielle Kang (USA) 68-68-70, Chella Choi (KOR) 68-66-72
207 – Lydia Ko (NZL) 69-70-68, Feng Shanshan (CHN) 67-68-72
208 – Jenny Shin (KOR) 71-70-67, Brittany Lang (USA) 67-68-73
209 – Thidapa Suwannapura (THA) 70-72-67, Cristie Kerr (USA) 68-73-68, Dewi Claire Schreefel (NED) 68, 72, 69, Belen Mozo (ESP) 72-67-70, Mariajo Uribe (COL) 69-70-70, Austin Ernst (USA) 71-66-72
210 – Ilhee Lee (KOR) 73-68-69, Sandra Gal (GER) 70-71-69, Lu Wanyao (CHN) 69-68-73
Source Article from http://www.ethiosports.com/2014/10/27/lee-anne-pace-wins-blue-bay-lpga/