The Rebels went into the game severely stretched, with Ben Harris injured and Dan Roberts needing to self-isolate. Max Worsfold took a place on the bench despite suffering with pain in his ankle, and was joined by young striker Sean Moore and Chris Flood, both having signed National League forms to help out Neil Baker and Jon Underwood.
Despite this, Slough took the game to their hosts and went close to opening the scoring twice in the first eight minutes.
Paul Hodges found himself in on goal with just four minutes played, but Ross Worner saved at his near post.
Minutes later, Warren Harris played in Josh Jackman, but the full-back fired narrowly wide of Worner’s far post.
Worner was again called into action when Ryan Bird unleashed a shot from distance, the goalkeeper turning the ball behind.
The game’s big talking point saw Havant’s George McLennan shown a straight red card following a late lunge on Matt Lench, which left the midfielder in pain and requiring treatment.
Now with a numerical advantage, Slough continued pressing for a goal with Aaron Kuhl seeing a shot deflect over the bar. The Rebels won a series of corner kicks but could find no way past Worner and the defenders in front of him.
Havant, meanwhile, rarely threatened Jack Turner’s goal but almost burst into life a minute before the interval courtesy of some individual brilliance from Tommy Wright. He evaded several challenges but could not give the supporters in attendance anything to cheer, firing just wide of the post.
Jon Underwood admitted afterwards that his side was not as effective in the second half, with the Rebels facing some pressure to go on and win the game. Chances were harder to come by, with Lench firing a free kick into the Havant defensive wall.
Havant’s best effort again came from Wright, whose 25-yard effort was turned aside by Turner, who got down low to his left.
Four minutes later, Worner’s long clearance down field led to a cross to the far post, where Josh Taylor met the ball - only to see Turner block his effort.
Ten minutes from time, Slough carved out more clear opportunities and Lench will feel he should have taken his.
Worner had only just made a magnificent block from Bird - albeit from an offside position - but could only watch as Lench fired into the side netting after being released by Kuhl, when he looked certain to score.
More late pressure from the Rebels did not pay dividends, with Lee Togwell having a strike blocked in the goalmouth following yet another corner kick.
Havant & Waterlooville Line up
Ross Worner, Benny Read, Godfrey Poku, Moussa Diarra, Sam Magri, Josh Taylor, Danny Kedwell, Bedsente Gomis, Tommy Wright, Roarie Deacon, George McLennan. Substitutes: Billy Clifford, Giuseppe Iaciofano, Craig Robson, Daniel Ajakaiye, Lucas Sinclair.