southampton beat hull city 2-0 at st mary 's in the premier league on saturday to keep top four hopes alive .
james ward-prowse opened the scoring for the home side from the penalty spot 10 minutes into the second half .
the southampton midfielder was brought on as a substitute at half-time and made no mistake from 12 yards .
graziano pelle made it 2-0 in the 81st minute as the italian ended his four-month wait for a premier league goal .