Look at the formbook, and there should only be one winner this evening when the Scarlets host the Ospreys at Parc y Scarlets. The home team have won all three of their matches so far, and are sitting pretty at the top of the table with 14 points. The visitors are marooned in 11th on a measly two points, without a win to their name so far.
Derby matches, of course, are seldom as simple to predict as the formbook would suggest. For all their disappointing form so far, the Ospreys are the defending league champions. And they'll see this evening's game as the perfect opportunity to bring their stuttering start to an end.
"Current form and what's gone before doesn't always play out in derby matches, especially Ospreys-Scarlets games," says Scarlets coach Simon Easterby.
"We're really pleased with the way we've started, but we're only three games into the season. And we understand as well that there's no better place for the Ospreys to come and try and get their season back on track than coming down here to try and upset our momentum."
Both regions are fielding different-looking sides for the encounter. The Scarlets have made eight changes to the team which defeated Connacht last weekend, with the likes of Ken Owens, Captain Rob McCusker and full-back Liam Williams returning to the starting fifteen.
For the Ospreys, Khan Fotuali'i is preferred to Rhys Webb at scrum half, Andrew Bishop replaces the injured Ashley Beck at centre, and Ryan Jones returns from injury to sit on the bench.
Kick off is at 1905.