And with local rivals Llanelli and Carmarthen Quins nipping at their heels, Lyndon Lewis' side know a win is vital.
Lewis saw his team emerge 37-12 winners in the reverse league fixture earlier this season and plays Lee Rees at scrum half with Rhodri Williams on duty with the Scarlets.
For Bridgend, Tom Grabham captains the Ravens from scrum half with former Pontypridd man Lewis Williams outside him.
The other Premiership game this weekend sees Cardiff travel to Llanelli on Sunday.
Macauley Cook makes a rare start for the Blue and Blacks in one of three changes to the team that started against Bedwas two weeks ago.
Reuben Tucker comes off the replacements bench to start at No 8 while Nick White moves from the back row to lock.
The only change in the backline sees Adam Field start on the wing in place of Ifan Evans who has sadly been forced to retire from rugby due to injury.
Bridgend: 15 Jamie Murphy 14 Ashley Evans 13 Nathan Edwards 12 Ross Jones 11 Glen Lewis 10 Lewis Williams 9 Tom Grabham (C), 1 Gary Carpenter 2 Matthew Dwyer 3 Owen Williams 4 Shaun O'Rouke 5 Lee Davies 6 Andrew Waite 7 Arthur Ellis 8 Lloyd Evans.
Replacements: Matthew Llewellyn, Chris Francis, Dan Suter, Owain Lloyd, Jonathan Vaughan, Glenn Holloway, Sam Campbell, Lewis Reece.
Llandovery: 15 Chris Knight 14 Sam Soul 13 Matthew Jacobs12 Jack Roberts 11 Jake Randell 10 James Garland 9 Lee Rees,1 Wyn Jones 2 Luke Lewis 3 Peter Edwards 4 Shaun Jones 5 Bryn Griffiths (C) 6 Shaun Miles 7 Richie Pugh 8 Kieran Murphy.
Replacements: Dean Howells, Dorian Williams, Llewelyn Jones, Luke Kendall, Tom Ball, Phil Day, Cerith Rees, Rob Walters.
Llanelli: 15 Dale Ford 14 Kristian Phillips 13 Nic Reynolds 12 Steffan Hughes 11 Kyle Evans 10 Johnny Lewis 9 Gareth Davies, 1 Shaun Hopkins 2 Kirby Myhill 3 Craig Cross 4 Adam Powell (c) 5 Lewis Rawlins 6 Duane Eager 7 Dan Thomas 8 Stuart Leach.
Replacements: Rhys Thomas, Craig Hawkins, Aled Hopkins, Nathan White, Ed Price, Justin James, Chris Keenan, Dion Jones.
Cardiff: 15 Jamie Davies 14 Adam Field 13 Matt Smith 12 Darren Ryan 11 Shaun Powell
10 Joe Griffin 9 Sion Hopkins, 1 Campese Ma'afu 2 Aaron Fowler 3 Ryan Harford 4 Nick White
5 Matthew Screech 6 Macauley Cook 7 Ben Roach 8 Reuben Tucker.
Replacements: Rhys James, Ethan Lewis, Jake Cooper-Woolley, Dan Partridge, Alwyn Lee, Bryn Phillips, James Thomas, Will Jones.