Match ends, Charlton Athletic 0, West Bromwich Albion 1.
Kenneth Zohore scored the only goal as West Brom knocked Championship rivals Charlton out of the FA Cup third round.
The sides made a combined 20 changes from their league games on New Year's Day, with three Charlton debutants.
Zohore scored his third goal of the season when he played a one-two with Kyle Edwards before side-footing home through Dillon Phillips' legs.
Youngster Josh Davison almost forced a replay for Charlton but his last-minute bicycle-kick hit the crossbar.
West Brom hit the woodwork twice. Chris Brunt's chip came off the crossbar and goalkeeper Phillips brilliantly kept out Charlie Austin's rebound.
Austin also struck the outside of the post from long range as West Brom kept on the pressure.
Andre Green had a chance to equalise on his Charlton debut but his shot from outside the box was saved by Jonathan Bond.
West Brom made 11 changes from their last game, but named a much more experienced team than Charlton, with Chris Brunt, Austin and Gareth Barry all playing.
Seven of Charlton's starting line-up were not born when Barry made his professional debut in May 1998.
The fourth round draw takes place on Monday at 19:35 GMT on BBC One and the iPlayer before Arsenal's game against Leeds.
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West Brom manager Slaven Bilic: "It is great to go through in the cup. It doesn't matter that you are going to have more games and the league game against Cardiff is going to have to be rescheduled.
"It's good to do a bit of both - to rest your players who are tired and to go through, and to give the players who didn't start a game some time.
"I think the performance was good. It wasn't easy because we didn't score more goals and there is always a chance for the opponent to score, and they had a chance at the end when they hit the bar.
"But apart from that, from the beginning to the end we were much better. We were dominant. We should have, and could have, scored more goals."
Charlton manager Lee Bowyer: "I thought they [his young players] did well. My team gave everything they had.
"Yes, at times we lacked a bit of quality, especially in the first half, in the final third, we rushed it and panicked a bit. But overall I think in the first half we restricted them and we didn't have much going forward ourselves.
"We were in it. To have that many young players out there, they did themselves proud. They didn't let me down. We've just lost 1-0 against a very good West Brom side."
- 48HenrySubstituted forMorganat 60'minutes
- 40Sarpong-WireduBooked at 69minsSubstituted forWilliamsat 70'minutes
- 18GreenSubstituted forHemedat 60'minutes
- 21EdwardsSubstituted forTullochat 90+3'minutes
- 16HarperBooked at 72minsSubstituted forShottonat 90+5'minutes
- 25Harib Al Habsi
- David Webb
- Shots on Target
Second Half ends, Charlton Athletic 0, West Bromwich Albion 1.
Attempt missed. Tomer Hemed (Charlton Athletic) left footed shot from outside the box is high and wide to the right. Assisted by Albie Morgan.
Substitution, West Bromwich Albion. Saul Shotton replaces Rekeem Harper.
Conor Townsend (West Bromwich Albion) wins a free kick on the left wing.
Foul by Albie Morgan (Charlton Athletic).
Corner, West Bromwich Albion. Conceded by Adedeji Oshilaja.
Substitution, West Bromwich Albion. Rayhaan Tulloch replaces Kyle Edwards.
Josh Davison (Charlton Athletic) hits the bar with a right footed shot from the centre of the box. Assisted by Naby Sarr with a headed pass.
Corner, Charlton Athletic. Conceded by Conor Townsend.
Attempt blocked. Toby Stevenson (Charlton Athletic) right footed shot from the right side of the six yard box is blocked. Assisted by Albie Morgan.
Attempt missed. Albie Morgan (Charlton Athletic) right footed shot from a difficult angle and long range on the left misses to the right from a direct free kick.
Foul by Dara O'Shea (West Bromwich Albion).
Abraham Odoh (Charlton Athletic) wins a free kick on the left wing.
Foul by Ahmed Hegazi (West Bromwich Albion).
Dillon Phillips (Charlton Athletic) wins a free kick in the defensive half.
Corner, West Bromwich Albion. Conceded by Abraham Odoh.
Gareth Barry (West Bromwich Albion) wins a free kick in the defensive half.
Foul by Jonathan Williams (Charlton Athletic).
Charlie Austin (West Bromwich Albion) hits the left post with a right footed shot from outside the box. Assisted by Chris Brunt.