In the men's event, Briton David Law produced a sparkling eagle on the 18th hole to snatch a one-stroke victory and claim his maiden European Tour title.
Law overturned a three shot deficit in the final few holes, birdieing the 16th before draining an eight-footer on the par-5 last to win on 18 under. "It's not something I expected".
A standout when attending Duke University in the U.S., the 25-year-old recovered from a shaky start to her final round when recording bogeys at two of her first three holes to finish with a round of 72 and win by two.
The Australian also missed a long eagle putt on the last that would have forced a playoff.
In the women's tournament, French golfer Celine Boutier has hung tough to claim a two-stroke victory.
Australian Ormsby carried a two-shot lead into the final round but a double-bogey on the 17th saw him gift the advantage to Law.
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The victory represents a remarkable turnaround on the course for Law, who was on the brink of taking on other work over the winter before winning last season's SSE Scottish Hydro Challenge and finishing 14th on the Challenge Tour to earn a European Tour card.
To have won today, it sort of changes things a little bit.
The LEADERS Top 10 competition awards a $100,000 bonus to the LPGA player with the most top-10 finishes through the completion of the event held immediately prior to the CME Group Tour Championship. Yeah, I'll go home, reflect a little bit on things and reassess.
"We got hammered with the rain for about three or four holes there, so it was really good to get through that stretch", Asian Tour regular Stieger said after sinking seven birdies to stay in the hunt.
The pioneering tournament, which is co-sanctioned by the European Tour and the LPGA Tour, is the only one in the world with male and female fields, playing in alternate groups on the same course and for equal prize money. "We make eagle, we post 18 under, you never know what can happen". In the event of a tie in total top-10 finishes, the award will go to the player with the most official wins, followed by most second-place finishes, third-place finishes, etc., until the tie is broken. "I'm super excited with the way I handled myself".
She only needed to shoot even-par for the day to finish at eight-under and win by two shots since the overnight leader, American Kim Kaufman, had an terrible day, starting with a needless double bogey from behind the green at the par-five fifth and ultimately shooting a 78.