The FA Cup is always famed for its storylines.
Whether it is 30 years on from when Division Four Wrexham beat English champions Arsenal, when 200-1 Oldham Athletic beat Fulham or Wigan knocking off Manchester City in the final.
Ahead of the weekend's third round ties, Sportsmail assesses each of them and looks at the likelihood of a shock...
Hull City will believe they can deepen Everton's woes as they host Rafa Benitez's players
This south London derby could be the fiercest tie of the round, with a rare sellout crowd expected at the Den.
Millwall are one of just two teams (Cardiff are the other one) from outside the top flight to reach the FA Cup final in the the Premier League era, after player-manager Dennis Wise led them there in 2004. They were quarter-finalists in 2017 and 2019.
Crystal Palace are twice finalists, most recently when then boss Alan Pardew infamously danced on the touchline to celebrate his side going ahead late on against Manchester United in 2016.
Gary Rowett's play-off-chasing Millwall are stubborn opposition and, despite being without star man Jed Wallace, they could cause problems for five-time FA Cup winner Patrick Vieira's side.
Kick-off: Saturday, 12.45pm, the Den.
TV: LIVE on ITV.
Chance of SHOCK: 3/5
Boreham Wood v AFC WimbledonOne of four non-league sides left, Boreham Wood are in the third round for the second straight season, losing to Millwall last year.
Boss Luke Garrard had a four-year stint at AFC Wimbledon during their rise up the non-league pyramid.
The former defender has led his side to a Wembley play-off final and they are fourth in the National League table. The Dons are locked in a League One relegation scrap.
Kick-off: Saturday, 3pm, Meadow Park.
Chance of SHOCK: 4/5
National League North side Kidderminster Harriers are the lowest-ranked side left in the draw
Kidderminster are the lowest-ranked side in the FA Cup.
The Carpetmen fell out of the Football League in 2005, then dropped into the National League North a decade later. Former journeyman midfielder Russell Penn is their boss and they are eight unbeaten.
They are looking to get to the fourth round for the third time and their star man is nine-goal striker Ashley Hemmings.
Twice semi-finalists Reading (1927 and 2015) are three points above the Championship relegation zone and will need to be wary of a shock.
Kick-off: Saturday, 3pm, Aggborough Stadium.
Chance of SHOCK: 2/5
Newcastle v Cambridge UnitedCambridge boss Mark Bonner has worked his way up from the club's schools coaching programme to tutoring the Under-8s side, and is now first-team boss aged just 36.
Since back-to-back quarter-finals for a team starring Dion Dublin in the early 1990s, Cambridge have progressed past the third round just three times.
They are 16th in League One after an against-all-odds promotion last term and their star man is former Norwich midfielder Wes Hoolahan, 39.
Six-time winners Newcastle have been knocked out at this stage in five of the last 10 seasons and, with a thin squad, could be worried about a 'cupset'.
Kick-off: 3pm, St James' Park.
Chance of SHOCK: 3/5
Port Vale v BrentfordPort Vale are sixth in League Two under manager Darrell Clarke.
They have toppled Premier League opposition twice, Southampton in 1994 and Everton in 1996, but have lost their last seven ties against top-flight teams.
Reliant on Tom Pope's goals for so many years, the forward has now moved on, and Vale are enjoying the form of journeyman Jamie Proctor, at his 15th club, and former Manchester United starlet James Wilson.
Thomas Frank could rotate his Brentford team. The Bees have reached the last eight four times but not since 1989.
Kick-off: Saturday, 3pm, Vale Park.
Chance of SHOCK: 4/5
Chesterfield are huge underdogs but in Kabongo Tshimanga they have a striker in fine form
Non-league against the European champions, this would be one of the biggest upsets ever - but no
