Crystal Palace held on to earn a narrow victory, their third consecutive home win of the season, against a tenacious Southampton at Selhurst Park.
Odsonne Edouard provided the only goal when Wilfried Zaha nipped the ball away from Lyanco and found Tyrick Mitchell, who cut back to set up a simple finish for Edouard.
Southampton improved significantly in the second half and were unlucky not to find an equaliser as Che Adams and Stuart Armstrong both went close and Palace nervously held on to the three points.
The defeat ends a run of three Premier League matches unbeaten for Southampton, who held then league-leaders Arsenal to a 1-1 draw last week.