Che Adam's superb strike was the difference as Southampton held on against Watford at Vicarage Road for their first away league win of the season.
Scotland forward Adams latched on to an Adam Armstrong pass before turning on the edge of the box and curling the ball into the top corner in the 20th minute.
Watford came close to an equaliser midway through the first half when Saints defender Kyle Walker-Peters cleared Ismaila Sarr's effort off the line.
And in the closing stages Southampton keeper Alex McCarthy saved brilliantly, diving to his right to keep out Ashley Fletcher.