Watch as the Whites struck back after going two behind in the opening quarter but the Saints held on at Motspur Park.
Here are the goals from the Premier League International Cup, which leaves the Whites on three points from two games.
Here are the goals from Motspur Park as visitors Tottenham Hotspur ran out 2-0 winners against Peter Grant's Under-21s.
Watch the goals as the young Whites hit top form and blew the Gunners away, beating them 3-0 in their own backyard.
The Whites made an early exit from the FA Youth Cup after falling short against Crewe Alexandra. Watch the goals.
Here are the goals as the young Whites went up against Reading and fell to a 3-1 defeat on the road.
Watch the goals from the Whites' Premier League International Cup opener, ahead of matches against Athletic Bilbao and PSV.
Watch the goals as the Whites made an early exit from the Under-21 Premier League Cup, losing 4-2 to Norwich City.
Here are the goals as the young Whites came up short against Leicester City, going down 0-2 at Motspur Park.
Watch the goals as the young Whites put in a determined display to fight back twice and draw at Brighton.