Looked nervous understudying for Boruc and flapped at a few set pieces in the first half.
As athletic as ever down the left flank, always providing the Saints' midfielders with an option on the overlap, although his delivery from wide was inconsistent.
Looked solid next to Fonte, distributing the ball effectively and winning the majority of the aerial battles.
A calm head in the heart of the Saints' defence. Along with Lovren, he shackled Campbell and cleared the ball well when needed.
Impressive going forward and solid defensively, the English youngster was a constant option down the right flank and a real menace when joining the Saints' attacks. Replaced by Clyne with twenty minutes to go.
His usual tidy self in the middle of the park. Kept possession well without making any impact going forward. A solid performance.
Like Davis and Schneiderlin, Cork set the tempo for most of the Saints' attacking moves, but failed to find the killer ball for Lambert or Lallana to run on to.
Hit the bar in the first half with a deflected effort, and worked well with Lambert and Lallana. Faded in the second half and couldn't provide the energy and running the Jay Rodriguez has given them throughout the season.
Tricky and skilful on the ball as we've come to expect but couldn't penetrate the Cardiff defence. Had a shot well saved in the first half but as Cardiff grew into the game, the diminutive Englishman grew more frustrated.
Quietly effective in the first half, linking up well with Lallana and going close to scoring with the host's first chance of the game.
Tested Marshall with a good free kick in the first half but, despite chances late on, he couldn't find that illusive goal for his side.
Was Cardiff's best player in the first half, making some excellent saves from Lambert and Ramirez to keep his side in the game, and again in the second when he gave his side an unlikely clean sheet.
Almost anonymous in the first half and replaced by McNaughton in the second half.
K. Théophile Catherine
Struggled against Shaw in the first half and couldn't make an impact going forward.
Scored a stunning goal and made some crucial tackles as the Bluebirds hung onto their lead for dear life.
Strong in defence and aerially dominant. Showed real grit along with his other defenders as the Saints pushed for an equaliser.
Couldn't manage to support Campbell in attack, and didn't have the running power to help his team in defence.
Failed to make any impact on the game as Cardiff struggled to get hold of the ball.
Worked hard for his team but didn't have the athleticism to deal with Chambers on his forward forays.
Made some excellent forward runs in the second half, with one fantastic effort saved well by Gazzaniga, but looked virtually anonymous in the first half.
Looked to have lost his bite in midfield as Lallana and co passed him by with ease. Replaced by the impressive Zaha after 60 minutes.
Ran the channels and worked tirelessly but was hopelessly isolated in the first half. Looked for dangerous when joined by Zaha in the second half.