After 190 minutes of competitive play spread over an abandoned game and this replayed fixture, the teams could still not be separated and it took penalties before the Dons went through 4-3.
The abandoned game between the teams was a rather dour affair and this one proved no different. Despite fielding a strong team Terry Brown would have been troubled by the lack of cohesion and passing - had he not been away, scouting at the Luton v Oxford game.
Tooting started the brighter team and within five minutes of kick off they slipped a through ball for what looked like a certain goal as Clayton's shot crashed past Seb Brown only to rebound to safety from the far post.
Following that, there were few chances, but those that did come generally fell to Tooting as they regularly exploited a lack of understanding in the back four. While Tooting played for the ball clipped through, or flicked on, behind the Dons back four, Wimbledon didn't look like troubling Tooting 'keeper Dave King at all.
It took until the second half for a goal to come and, not surprisingly given what had gone before, it was scored by Tooting. Early in the second half, yet another ball was laid off into the path of Simon Parker and this time he put it into the corner, well out of the reach of Brown.
Wimbledon equalised within a couple of minutes when a free kick into the box was badly headed by a defender into the path of Jay Conroy. He hit it on the volley and although he didn't really get a lot of power into the shot, it hid Jon Main on the backside and deflected into the net. They all count.
From then on the game was almost bound to go to extra time, which it duly did, with only a goalbound shot from Main looking like breaking the deadlock, while Tooting squandered a couple of good chances when Parker again evaded the Dons defence.
It often happens that extra time starts with a goal and sure enough it happened again, as Main scored with a more orthodox part of his anatomy when he nodded home from a corner that had been flicked on at the near post.
It looked like being enough to win it until, at the death, a loss of concentration allowed Tooting to get to the dead ball line and cross the ball - after a scramble, substitute Jason Henry managed to squeeze the equaliser home.
And so to penalties where Sam Hatton, Elliott Godfrey, Derek Duncan and Josh Parker scored, interspersed by misses by two teammates, but Tooting missed one, had one well saved by Brown, and finally hit the underside of the bar and watched the ball come out, to seal the Dons' victory.
This was a far from vintage performance by the Dons. They never got their passing game going and too often the ball was launched forward towards Peter Rapson and Main, neither of them likely to win the ball in the air against the tall Tooting centre backs. The 4-3-3 formation left gaps in midfield that Tooting exploited well, especially Allan McLeod who appeared to be playing with an injury, given how often he limped away after merely passing the ball.
This was a disappointing performance with too many senior players below their usual standard. On the bright side, Hatton made a significant impact when he came on as a substitute, Ryan Jackson again made a good impression at right back, Parker showed off his pace to good effect, and Rapson led the line well despite a lack of service and match practice.
And so to a midweek trip to Harrow Borough in the next round.