Match ends, Derby County 2, Southampton 2.
Championship side Derby came from 2-0 down to take Southampton of the Premier League to an FA Cup third-round replay.
Nathan Redmond's deflected effort put the Saints ahead four minutes in before the winger added the second with a fine 25-yard strike in the 48th minute.
But hosts Derby struck back with two goals in three minutes.
First, Jack Marriott volleyed into the bottom corner from Tom Lawrence's chipped pass, then Lawrence drilled in the equaliser from the edge of the box.
Marriott could have sealed a superb victory for Derby on Frank Lampard's FA Cup debut as a manager but he fired over from 10 yards with the final kick of the game.
Earlier, Mohamed Elyounoussi should have put Southampton 3-2 up but he headed straight at goalkeeper Kelle Roos after meeting Charlie Austin's cross unmarked.
Lampard changes spark improvement
Before the match, the tie did look like one that could prove difficult for the Premier League side. Southampton are 18th in the top flight, while the Rams are sixth in the Championship.
Despite six changes, Southampton's side still included Redmond, Austin, James Ward-Prowse and Shane Long and Redmond's two goals - the first deflected in off Richard Keogh and the second a brilliant hit into the top corner - put them on course for a comfortable win.
Derby had been largely flat in the first half but Lampard, who won the FA Cup four times as a Chelsea player, responded by introducing David Nugent as a second striker and his side dramatically improved.
Both goals were excellent finishes at the end of good team moves, although Southampton were foolishly stretched at the back given their 2-0 lead.
Lawrence, making his return from injury, was given too much space to drive towards goal and was then not closed down before shooting low into the bottom corner.
Their were chances at either end to win the game and secure a place in the fourth round but slack finishing means both sides will be in Monday's draw for the fourth round.
Lampard said it was "special" to take charge of his first FA Cup game as a manager.
"I've had magic in this cup," said the 40-year-old former England midfielder.
"I was lucky enough to win it four times with Chelsea. The FA Cup never loses its energy for me.
"It is important for me and this club. It was special for me. I am pleased we didn't go out on a damp squib like it looked like doing."
- 4BrysonBooked at 64mins
- 41BirdSubstituted forNugentat 52'minutes
- 23HolmesSubstituted forJozefzoonat 88'minutes
- 14MarriottBooked at 87mins
- 10LawrenceSubstituted forWaghornat 81'minutes
- 2Cédric Soares
- 11ElyounoussiBooked at 33minsSubstituted forBarnesat 71'minutes
- 10AustinSubstituted forJohnsonat 79'minutes
- Oliver Langford
- Shots on Target
Second Half ends, Derby County 2, Southampton 2.
Attempt missed. Jack Marriott (Derby County) right footed shot from the centre of the box is too high. Assisted by David Nugent following a fast break.
Attempt missed. Callum Slattery (Southampton) right footed shot from outside the box is close, but misses to the left. Assisted by Jack Stephens following a corner.
Corner, Southampton. Conceded by Kelle Roos.
Attempt saved. Nathan Redmond (Southampton) left footed shot from the left side of the box is saved in the bottom left corner. Assisted by James Ward-Prowse.
Foul by David Nugent (Derby County).
Cédric Soares (Southampton) wins a free kick in the defensive half.
Foul by Martyn Waghorn (Derby County).
Callum Slattery (Southampton) wins a free kick in the defensive half.
Attempt saved. Martyn Waghorn (Derby County) left footed shot from outside the box is saved in the bottom left corner.
Substitution, Derby County. Florian Jozefzoon replaces Duane Holmes.
Shane Long (Southampton) wins a free kick on the right wing.
Foul by Max Lowe (Derby County).
Jack Marriott (Derby County) is shown the yellow card for a bad foul.
Matt Targett (Southampton) wins a free kick in the defensive half.
Foul by Jack Marriott (Derby County).
James Ward-Prowse (Southampton) wins a free kick in the defensive half.
Foul by Martyn Waghorn (Derby County).
Foul by Cédric Soares (Southampton).