World No 11 Olivia Mehaffey made six birdies in her last 11 holes to move within two stokes of the lead entering today's final round of the South American Amateur Championship in Peru.
The Royal County Down Ladies' star dropped two early shots at the fourth and fifth but birdied the eighth to stop the rot and then caught fire, storming home in five under 31 for a 68 that moved her up eight spots to solo fourth at Lima Golf Club.
At four under, 18-year old Mehaffey is two behind Paraguay's Sofia Garcia (68), who leads by one stroke from Peru's Lucia Gutierrez (70) and England's Bronte Law (67).
Castletroy's Chloe Ryan continued her fightback from a poor opening round with a second successive 75 leaving her in joint 41st.
In the men's championship, Knock's Colin Fairweather birdied the 18th for a second successive 73 that leaves him tied for sixth on two under with Argentina's Andres Gallegos and England's Marco Penge, six strokes behind Uruguay's Juan Alvarez.
Alvarez shot a three under 69 and leads by just one stroke in the R&A supported event from Welshman David Boote (71) and by three from Matias Simaski of Argentina.
Massereene's Tiarnan McLarnon, the Irish Close champion, shot a 73 but climbed 27 places to tied 26th on six over.