Three second-half goals in the space of nine minutes from Chelsea turned Southampton's day from a dream into a nightmare as they were downed 3-2 by the Blues at St Mary's on Saturday.
Saints looked set to climb out the Premier League's relegation zone after centre-back Jan Bednarek put them 2-0 up on the hour, with Dusan Tadic having opened the scoring midway through the first half.
They looked remarkably comfortable for much of the game against the defending champions but collapsed when substitute Olivier Giroud rose to make it 2-1 with 20 minutes to go.