Southampton earned a sixth successive clean sheet in all competitions as they drew 0-0 at Leicester City.
The visiting side started strongly, with Charlie Austin hitting a post with a volley from an acute angle.
Oriol Romeu made three blocks to deny Leicester after Virgil van Dijk's underhit backpass had allowed Jamie Vardy in on goal.
A tightly contested encounter continued in this vein after the break, with Austin spurning a great chance when his chip was saved by Kasper Schmeichel.
Danny Drinkwater tested Fraser Forster with a powerful strike and Leicester's Robert Huth hit the crossbar as the champions, unbeaten at home this season, pushed for a winner.