Mounties are the first team to book a place in the 2018 Harvey Norman NSW Women's Premiership Grand Final, downing minor premiers South Sydney Rabbitohs 14-12 at Leichhardt Oval in the sides' Major Semi Final clash.
Without NSW Women's Origin star Simaima Taufa for much of the second-half, Mounties rallied to defeat the fancied Rabbitohs outfit, winning through to the competition's decider on Friday 10 August.
A late penalty awarded to Mounties saw the side edge two points clear, as halfback Talia Lealaiauloto slotted a gift shot on goal with only seconds to play.
South Sydney's loss means they will face off with Cabramatta in Week Three of the finals series, as earlier in the afternoon, Cabramatta stunned Cronulla-Caringbah 30-4 to ensure their season progressed.
Leading 12-4 at half-time, Cabramatta ran in 18-unansweed second-half points in a clinical display, set to have the Rabbitohs on notice.
In a game that lacked rhythm, Cronulla Caringbah were their own worst enemy – error-riddled in attack and ill-disciplined in defence, the Sharks were left to rue what might have been come the sound of the final siren.
The South Sydney-Cabramatta preliminary final will be contested at Leichhardt Oval next Saturday (4 August), the match to kick-off at 3.00pm (AEST).