It's Judgement Day for Cardiff Blues and Ospreys as they go head-to-head on the final day of the Guinness PRO14 campaign.
It's a winner-takes-all as both sides fight for a place in the Heineken Champions Cup qualification play-off.
Cardiff Blues: Gareth Anscombe; Owen Lane, Rey Lee-Lo, Willis Halaholo, Aled Summerhill; Jarrod Evans, Lloyd Williams; Rhys Gill, Ethan Lewis, Dillon Lewis, Seb Davies, Rory Thornton, Josh Turnbull, Olly Robinson, Nick Williams (capt.)
Replacements: Kirby Myhill, Rhys Carre, Dmitri Arhip, George Earle, Shane Lewis-Hughes, Tomos Williams, Garyn Smith, Jason Harries
Ospreys: Dan Evans; George North, Cory Allen, Owen Watkin, Hanno Dirksen; Sam Davies, Aled Davies; Nicky Smith, Scott Baldwin, Tom Botha, Adam Beard, Alun Wyn Jones, Olly Cracknell, Justin Tipuric, James King (capt)
Replacements: Sam Parry, Rhodri Jones, Ma'afu Fia, Bradley Davies, Dan Lydiate, Matthew Aubrey, Luke Price, Keelan Giles
Last Time Out: Ospreys 20 Cardiff Blues 11
Following back-to-back derby victories, Cardiff Blues travelled to Swansea with confidence, but the hosts came flying out of the starting blocks, with Scott Williams crossing the whitewash for an early score.
John Mulvihill's side responded after a crossfield kick from Gareth Anscombe was expertly taken by Garyn Smith, who slid in at the corner.
George North's try at the end of the first quarter eventually proved crucial, however, as a late drop goal from Sam Davies sealed the victory for Ospreys and took away a bonus point from the Blues' grasps.
Head-to-Head: Olly Robinson v Justin Tipuric
It's battle of the bluecaps at Principality Stadium, as openside flankers Olly Robinson and Justin Tipuric go toe-to-toe.
Tipuric has been a talisman for the Swansea-based outfit in recent years, but Robinson has starred in the seven shirt for Cardiff Blues this season, topping the Guinness PRO14 chart for turnovers and tackles.