The Waratahs ground out another victory when they beat the Force 20-15 in Sydney which moves them into the top six.
The victory moves the Waratahs into the top six and cuts the gap between them and the Reds in the Australian conference to 9 points.
Although the Force were in control of the match after the first half and led 6-9 at half time they could not cross the Waratahs tryline and relied on James O'Connor's boot for all of their points.
Ryan Cross and replacement hooker John Ulugia scored the Waratahs tries and Kurtley Beale had two conversions and two penalties for the winners.
Filling in for Wallabies star Tatafu Polota-Nau, Ulugia crossed in the 70th minute to give the Waratahs the win.
Flyhalf James O'Connor accounted for all of the Force points with five penalties, giving the Force a 15-13 lead before Ulugia's late try.
The Waratahs have a bye in next weekend's 13th round and are guaranteed four competition points before hosting the last-placed Lions the following week.
In a tight first half dominated by strong defense and big hits, O'Connor nailed three penalties to Beale's two.
The Waratahs took the lead for the first time in the 44th with a fortuitous try by center Ryan Cross - a Beale penalty attempt ricocheted off the left upright and straight into the arms of Cross, who strolled over.
Beale converted for a 13-9 advantage before O'Connor nudged the Force back ahead with his fourth and fifth penalty goals.
Then 10 minutes from full time John Ulugia burrowed his way over and scored the Waratahs second try which gave them the lead.
"It was certainly tough," Waratahs captain Dean Mumm said. "They made us work for every scrap of possession.
"Every win is important. That's two in a row now and we just need to keep winning."
Final Score Waratahs 20 Force 15
Tries - R Cross, J Ulugia
Pen - K Beale 2
Con - K Beale 2
Pen - J O'Connor 5
Referees: Stuart Dickinson (Australia)
Assistant referees: James Leckie (Australia), Andrew Lees (Australia)
Television match official: George Ayoub (Australia)
Waratahs:15. Kurtley Beale , 14. Lachie Turner , 13. Ryan Cross , 12. Tom Carter , 11. Sosene Anesi , 10. Berrick Barnes , 9. Luke Burgess , 8. Ben Mowen , 7. Pat McCutcheon , 6. Dave Dennis , 5. Sitaleki Timani , 4. Dean Mumm (c) , 3. Sekope Kepu , 2. John Ulugia , 1. Benn Robinson
Reserves , 16. Ben Roberts , 17. Al Baxter , 18. Kane Douglas , 19. Chris Alcock , 20. Brendan McKibbin , 21. Daniel Halangahu , 22. Tom Kingston
Western Force:1. Pek Cowan,2. Nathan Charles ,3. Matt Dunning ,4. Sam Wykes,5. Nathan Sharpe (Captain),6. Matt Hodgson,7. David Pocock,8. Richard Brown ,9. Brett Sheehan,10. Willie Ripia,11. David Smith,12. James O'Connor,13. Mitch Inman,14. Nick Cummins ,15. Patrick Dellit
Reserves:,16. Ben Whittaker ,17. Tim Fairbrother ,18. Tom Hockings,19. Ben McCalman,20. James Stannard,21. Rory Sidey,22. Alfie Mafi