Kilkenny man Thomas O'Connor fired Wrexham into the fourth round of the FA Cup, as the League Two outfit dug out a 1-0 win at Shrewsbury Town.
O'Connor's deflected strike in the 72nd minute settled a tense affair and sent the Welsh outfit through.
James McClean also started for Wrexham, who rode their luck at time but grew into the contest on the turnaorund.
Republic of Ireland underage international O'Connor scored against Coventry City and Sheffield United in the cup last season, when Wrexham also reached the fourth round, and he did the business again to send the travelling fans wild.
David Moyes faces a trip back to his former club after West Ham were held to a 1-1 draw by Bristol City.
The Hammers looked on course for a comfortable afternoon when Jarrod Bowen fired them into an early lead.
It proved to be anything but, however, after a second-half equaliser from Tommy Conway secured a replay for the rocking Robins, who had three Republic of Ireland internationals in their starting lineup: goalkeeper Max O'Leary, Mark Sykes and Jason Knight.
West Ham's squad would have been given a whole a week off had they won this third-round tie, but they will now be dragged back in on Friday as Moyes, who reached Wembley twice as a player with City, prepares for a return to Ashton Gate.
Luton were frustrated by League One high-flyers Bolton as the teams played out a drab goalless draw at Kenilworth Road.
Rob Edwards fielded a near-full strength side in spite of the hosts' ongoing fight to survive in their debut Premier League campaign, but they were unable to break down the side currently sitting second in the third tier.
Republic of Ireland wide man Chiedozie Ogbene played the full 90 minutes for the Hatters.
West Brom cruised through after a first-half blitz against Aldershot.
Early goals from Nathaniel Chalobah and Jovan Malcolm set the Baggies on course for a 4-1 win and ended any thoughts the National League visitors had of a shock.
Daryl Dike - making his first appearance since April following a serious Achilles injury - added a third before half-time with the gulf between the Championship promotion-chasers and the Shots obvious.
There were never any hopes of a comeback and Tom Fellows' first senior goal completed the scoring late on before Ollie Bray's consolation.
Patrick Bamford's moment of brilliance lit up Leeds' smooth passage to the next round as they eased to a 3-0 win at Peterborough.
The forward was handed only his second start of the campaign as boss Daniel Farke rang the changes.
And Bamford responded by delivering a stunning strike shortly after half-time to double an advantage provided by Ethan Ampadu's first goal in Leeds colours.
Captain Ampadu then sealed the win late on as his sudden taste for scoring continued.
Nottingham Forest had to come from two goals down to avoid history repeating itself as they earned a 2-2 draw with League One Blackpool.
Forest looked like heading out to the Seasiders at this stage for a second straight year when they conceded twice in three first-half minutes, with Jordan Lawrence-Gabriel and Albie Morgan getting the goals.
But the Premier League outfit hit back with goals from Nicolas Dominguez and Morgan Gibbs-White either side of the break.
They could not find a winner, though, meaning the tie will be settled with a replay at Bloomfield Road, where Forest were beaten 4-1 last season.
Kevin De Bruyne made an eye-catching return and Phil Foden struck twice as holders Manchester City thrashed Huddersfield 5-0.
