Grace, 23, tied with former major winners Ernie Els and Retief Goosen at 12-under-par 280 over the par-73, the insist 6,652-meter artificial link, then made two-putt birdie on the par-five 18th hole play-off first, while Els and Goosen could only par.
It was the second consecutive European tour Kelly WINS after he qualified for the champions to win the event just last week the Joburg open.
The first prize of Euro 350,000 took his earnings in two weeks to 556,050 euros and made him leader of the escape Tour Race to Dubai.
Have warning 258 in world rankings before last week’s win, he is guaranteed to be in the top 100 when the rankings are updated this week.