Chris Baird's first-ever goal sparked Southampton to victory over struggling Luton and extended their unbeaten run to five matches.
Northern Ireland international Baird rose to head home a teasing corner from young Welsh full-back Gareth Bale.
Polish striker Grzegorz Rasiak netted his 11th goal of the season from the penalty spot after Leon Barnett was penalised for handball.
Russell Perrett's header threatened to inspire a Luton fightback.
George Burley on Grzegorz Rasiak's penalty winner:
Burley said: "It was definitely a handball. Their player looked as if he was trying to play basketball.
"More importantly, that is five games unbeaten and we are starting to find that consistency we need to get out of the division.
"I was pleased with the first half when we scored two and created lots of chances.
"This sets us up for our match with Birmingham next week and it should be a cracker."
Luton manager Mike Newell on Rasiak's penalty winner:
"The goal that decided the game was given for handball but I know it wasn't handball by my defender.
"The ball struck the Southampton striker's hand and we have four or five players in our dressing room who will swear on their lives that the referee has made a mistake.
"That is another defeat and it is difficult to take too many positives out of the game although the second half was much better than the first.
"There is a lack of confidence after six defeats in a row but we will keep trying to play football, the sort I know we are capable of."
Southampton: Davis, Makin, Baird, Lundekvam, Bale, Surman, Viafara (Jones 70), Wright, Pele, Skacel (Licka 86), Rasiak.
Subs Not Used: Bialkowski, Ostlund, Wright-Phillips.
Goals: Baird 15, Rasiak 38 pen.
Luton: Kiely, Foley (Bell 65), Perrett, Barnett, Emanuel, Edwards, Robinson, Heikkinen, Brkovic, Feeney, Boyd (Morgan 46).
Subs Not Used: Beresford, Holmes, Langley.
Goals: Perrett 67.
Referee: P Armstrong (Berkshire).