Southampton conceded a 90th-minute goal to draw with Middlesbrough as their Championship automatic promotion hopes suffered a blow.
Adam Armstrong's first-half strike was cancelled out by Emmanuel Latte Lath's late equaliser to leave Saints nine points behind second-placed Leeds United.
The hosts failed to capitalise on a number of chances at St Mary's as Latte Lath pounced for his 10th goal of the season.
Saints only had to wait 12 minutes to go in front as Kamaldeen Sulemana's jinking run and searching cross was sliced awkwardly into the air by Jonny Howson.
The ball fell to the feet of Armstrong whose drilled strike nestled into the bottom left-hand corner of Seny Dieng's net.