Kapur, who began the week with a stunning 66 has since shot 73-71 in the next two rounds. At six-under 206, he is Tied-20th, but 11 shots behind the leader, Louis Oosthuizen who takes a three shot lead into the final round.
Looking unstoppable at Lake Karrinyup Country Club, Oosthuizen was 7-under the card through 15 holes and had stretched his lead out to five shots. However back-to-back bogeys saw him come back to the field, setting up the final round for a dramatic finish.
Kapur, who has a troublesome shoulder that flared up before the first round and has still not healed said: "It has been an up and down day again. I got off to a good start. But that stretch from six to11 seemed to get me again. I didn't really hit any poor shots. I hit it into the greenside bunker on seven and ended up making bogey there and on 11, I three-putted. So that stretch of four to five holes was frustrating."
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"The encouraging thing out of all these is that I'm hitting lots of good shots. Some of the bogeys I made were either bad judgment or just one or two bad swings. My pace on the greens was off a little as they felt a little slower to me today. I'm just going to work on that and hopefully come out with a hot putter like I did the first day.
Overnight leader Peter Uihlein of the United States slipped one spot down to second place with France's Romain Wattel after he signed for a 71 while local hopefuls Jason Scrivener (205) and Brett Rumford (206) are in fourth and fifth place respectively.
A shot further back and rounding out the top-10 are Marcus Fraser (AUS), Mikko Korhonen (FIN), Richard Lee (CAN), Mardan Mamat (SIN) and Alexander Levy (FRA).