Victor Wanyama’s late goal lifted the Saints past a stingy 10-man Swansea City in Wales on Saturday.
The loss drops Swansea to fifth place on nine points, while Saints jump into second place with 10 points.
England manager Roy Hodgson was in attendance to check out the bevy of Saints youth products on display, including James Ward-Prowse and Jack Cork.
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Despite plenty of possession for Southampton, it was Swans that came close when Nathan Dyer tripped en route to an attempted six-yard box conversion in the 13th minute.
Graziano Pelle tried an acrobatic overhead kick in the 16th minute, but was unable to control the arch of the open attempt.
The game’s trajectory changed in the 40th minute, as Swans striker Wilfried Bony picked up his second yellow card for a rash challenge. Both were silly fouls, the second more sinister given his status on yellow.
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Swans tried to lock it down in the second half, and limited Southampton’s opportunities rather effectively for the majority of the half. Saints edged forward in shots as the match wore on, but would there be a goal?
Yes. Wanyama, the ex-Celtic man, took a feed from Pelle and buried it in the goal in the 80th minute.
Swansea City: Fabianski, Rangel, Fernandez, Williams, Taylor, Ki (Emnes, 83′), Shelvey, Sigurdsson, Dyer (Montero, 59′), Routledge, Bony
Red card: Bony (40′)
Southampton: Forster, Clyne, Fonte, Yoshida (Gardos, 46′), Bertrand, Schneiderlin, Cork (Davis, 64′), Ward-Prowse (Wanyama, 69′), Tadić, Long, Pellè
Goal: Wanyama (80′)