14 but fumbled with five bogeys
and two double bogeys
, dropping him way down to 14th at 78 in a tie with Michael Bibat and Arnold Villacencio, 10 strokes off Van der Valk.
Unfortunately further bogeys
on 15 and 18 undid some of that good work as Donaldson completed his round on one over, five adrift of clubhouse leader Bill Haas on four under.
Jim Furyk saw his one stroke lead heading into the final round dissipate with two bogeys
on the 13 th and 16 th holes, and placed seventh Sunday.
Ryder Cup star Molinari, playing in front of his home city fans, had six birdies and two bogeys
in a round of 68.
The German finished with a two-under-par 70 along with Anthony Kim, who followed up an eagle at the seventh with two birdies and two bogeys
The 30-year-old, winner of the 2003 Russian Open, birdied the second, third, fifth and eighth, while Singh birdied four of his first eight holes and then mixed two more birdies with two bogeys
around the turn.
Though he managed three birdies, Webster, like many others, was unable to control his ball in appalling conditions and carded three double bogeys
, six bogeys
and just six pars.
England's Paul Casey also had a torrid time with six bogeys
and a double bogey
in his round of 76 to finish two shots behind Forsyth on 225.
Six behind at the start of play, he missed a three-footer to bogey
the fourth, got it back with an iron to five feet at the sixth, but failed to birdie either of the two par-fives on the front nine.
World number one Tiger Woods was three shots off his playing partner at eight under, a double bogey
on the par-four seventh letting him down.
Another Thai bet, Thanuttra Boonraksasat bounced back from an opening hole bogey
with three birdies in a four-hole stretch from No.
Dottie Ardina, seeking an end to a string of mediocre finishes in the country's premier ladies circuit which she used to dominate, gunned down three birdies but made three bogeys
for a 72 while Cyna Rodriguez hardly recovered from a double-bogey
mishap on the par-3 No.