Bournemouth beat Southampton in a league fixture for the first time since 1958 at the Vitality Stadium on Tuesday.
The hosts controlled the game from start to finish, restricting their South Coast rivals to few chances and took the two that came their way - Steve Cook and Benik Afobe finding the net from Matt Ritchie free-kicks.
Eddie Howe's side are now eight points clear of the Premier League's bottom three in 15th place, ahead of crucial fixtures against relegation rivals Swansea City and Newcastle United.
If they play like this they'll have little to worry about. Here's how the players fared:
Artur Boruc 7/10 - Had very little to do against his old side but looked assured when called upon.
Adam Smith 7/10 - Bertrand didn't get much joy down his side, allowing Ritchie to have a greater impact on proceedings.
Simon Francis 8/10 - Another strong performance at centre-back for Bournemouth's captain. Mane, Long, Austin and Pelle got little change out of him or Cook.
Steve Cook 8/10 - Took his goal extremely well for a defender and didn't give Southampton's strikers a sniff.
Charlie Daniels 7/10 - Dealt with Cedric well down the right, and arguably gave the Portuguese more to think about.
Matt Ritchie 8/10 - Started the game as though he were Messi and continued in that vein. It was from his free-kicks that Bournemouth scored both of their goals.
Harry Arter 7/10 - Southampton couldn't get near him in the first half. Worryingly withdrawn in the second due to injury.
Andrew Surman 7/10 - So good were the former Saints midfielder and Arter in possession that Koeman brought on an extra midfielder with 35 minutes played.
Max Gradel 7/10 - Looked lively on his second start since injury. Showed good feet but couldn't conjure up anything meaningful.
Josh King 8/10 - His refusal to give up on a lost cause led to the free-kick from which Cook scored. It was an impressive display from a man who had little sleep due to the birth of his child.
Benik Afobe 7/10 - Always an outlet and a willing runner into channels despite few goalscoring chances arising. His patience paid off, though, and his goal was really well-taken.
Dan Gosling 6/10 - Carried on Arter's work and may need to more often in the coming weeks.
Lewis Grabban 6/10 - Showed good discipline after replacing the tied King.
Marc Pugh 5/10 - Had little time to make an impact.