Southampton are set to face Hull City in this year’s Championship play-off final.
The Saints needed extra time to beat Middlesbrough 2-1 on Tuesday night.
The first leg had ended goalless at the Riverside Stadium.
It was the visitors who took the lead at Saint Mary’s through Riley McGree.
But Southampton equalized, thanks to Ross Stewart’s towering header on the stroke of half time.
With penalties looming, Shea Charles’ cross from the right evaded everyone and bounced past Sol Brynn into the back of the net in the 116th minute.