The result, Tottenham’s fifth defeat of the season, leaves them looking over their shoulder with bitter rivals Arsenal just three points behind.
Southampton leapfrog West Ham into sixth and have given themselves a real shot boost their Europa League hopes.
“I don’t score many so that was a great day,” Davis said. “They have great quality, Spurs.
“The aim at the start of the season was to do better than last year, and we have matched last season’s points tally.
“Who knows where one more win will take us.”