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Dover travelled to Havant for the second time in four days and returned with a hard-earned point on Tuesday night.
The sides played for 62 minutes on Saturday before a waterlogged pitch prompted the referee to abandon proceedings.
Harry Ottaway gave Chris Kinnear's (pictured) side the perfect start in the rearranged clash, heading home a Daryl McMahon cross on eight minutes.
However, the goalscorer later went off with a knee injury and Alex Grant drew Havant level seven minutes before the interval.
Dover substitute Billy Bricknell had a goal ruled out for offside in the second half but neither side could force a winner.
The draw leaves Dover third in Blue Square Bet South, knowing victory at home to Dorchester on Saturday will mathematically secure them a play-off place.