Fisher took the lead early, just as they had on Saturday, with Lenny Piper this time being played in and he was able to hit a controlled shot across the goal and into the corner.
Fisher had a few half chances, their pace and trickery upfront continued to cause Slough problems, but the Rebels drew level through Ian Hodges with just over thirty minutes on the clock. Andy Ballard lumped the ball forward and Hodges chased alongside Francis Duku. The defender attempted to head the ball back to James Pullen but didn't get a clean contact on it and this allowed Hodges to lift the ball over the stranded Pullen and into the net, bringing the Rebels onto level terms.
Duku then had the misfortune of putting the ball into his own net. A long throw in from Ballard from the left missed everyone, Pullen included, at the near post and as Michael Alexis charged in, the ball hit Duku on the chest and bounced into the empty net.
Fisher were back on level terms on the stroke of half time. Chris Piper lifted the ball into the area and Slough did not clear their lines. Steve Watts, who had hit two in the league game, took the chance presented to him and sidefooted home from eight yards out.
Ahmed Deen headed off the bar before the half was concluded but the two sides went in level.
The home side started quickly in the second half as Charlie Taylor twice went close in the opening minutes, then West also had two more opportunities saved by Masters, before the Rebels fell behind again.
Masters came out to punch a Deen cross but didn't get good purchase on it and the ball was fed back into the area and Taylor got his name on the scoresheet, putting the ball past the covering Steve Daly from close range.
Taylor got his second of the night nine minutes later with another composed finish. His run was well found by Michael Smith and the striker converted with the inside of his left foot nicely into the corner of the net.
The final minute saw Slough give away a costly penalty which further extended the home sides advantage for the second leg. Hamid Barr got into the left of the box and squared up with Mark Avery. Barr pushed the ball to Avery's right and the striker attempted to slide tackle the ball but got the striker instead. Despite some heated exchanges between the Fisher players, presumably arguing over who should be taking the penalty, Watts stepped up and sent Masters the wrong way from the spot.
With a three goal advantage going into the second leg, Slough will have to be at their absolute best if they have any hopes of progressing.
Fisher Ath Lineup
James Pullen, Chris Piper, Ahmed Dean, Charlie Hearn, Francis Duku, Jason Rose, Hamid Barr, Michael Smith, Charlie Taylor, Steve Watts, Lenny Piper. Subs: Damian Scannell, Anthony Riviere (for Smith), Nick Davies, Mark Warren.