Sekou Mara's double strike helped Southampton to a comfortable FA Cup replay win against Watford to land them a trip to play Liverpool at Anfield.
The French striker, who had been linked with a loan move in the transfer window, scored twice in the space of five minutes in the second half after a dour opening 45 minutes.
Che Adams added a third to dispel any doubt in a game in which both managers made seven changes with promotion from the Championship being their priority.
Saints' club record-breaking unbeaten run - which stretches to 24 in all competitions - has moved them to second place in the Championship and into the last 16 of the cup.