Starting the week in 122nd position on the FedEx Cup points table, Allenby needed to at least make the cut to safely secure his right to play the PGA Tour next season but when he missed the cut of Friday it became a waiting game to determine who may or may not go past him over the weekend.
He would eventually finish in 125th position and in doing so has avoided the need to play the Web.Com Tour Finals.
It was touch and go for much of the afternoon as Heath Slocum, who had started well behind Allenby in the points table, fought back late in his round and a missed putt from around ten feet at the final hole may well have been the difference between either Allenby or Slocum getting that final spot.
The winner of the event was a resurgent Camilo Villegas, one of the stars of the PGA Tour several seasons ago when he won events including the Tour Championship.
A two week break back in his homeland of Colombia without touching a club seems to have worked wonders for the 32 year old, who recorded his first top ten on the PGA Tour in well over a year and his first PGA Tour win since the 2010 Honda Classic.
Villegas' outward nine of 29 set up the victory but it was hard fought all the way with as many as six players in with a chance over the final hour of play.
In the end Villegas prevailed by one over Bill Haas and Freddie Jacobsen with another shot back to Slocum.
The leading Australian and one of only two to make the cut this week was Stuart Appleby who finished 38th with Steve Bowditch 57th.
Austraians making it through to the opening event of the FedEx Cup playoffs at the Barclays next week therefore are Adam Scott, John Senden, Jason Day, Marc Leishman, Matt Jones, Steven Bowditch, Geoff Ogilvy, Aaron Baddeley, Stuart Appleby and Robert Allenby.