First-half strikes from James Robinson and Rod Thornley gave Altrincham victory over Cambridge.
In the fourth minute Robinson converted Chris Adams' near-post corner.
The hosts doubled their advantage in the 26th minute when Thornley raced onto Colin Little's pass and rifled the
ball into the top corner.
Cambridge deservedly hit back through David Bridges, who found himself in space on the edge of the penalty area to pick his spot past Stuart Coburn.
Altrincham: Coburn, Scott, Band, Maddox, Adams, Murphy, Aspinall (Chalmers 88), Owen, Robinson (Potts 82), Thornley (Lugsden 72), Little.
Subs Not Used: Rose, McFadden.
Goals: Robinson 4, Thornley 26.
Cambridge Utd: Howie, Morrison, Duncan, Peters (Davies 34), Jaszczun (Westcarr 88), Pitt, Coldicott, Woolaston, Brady, Guy, Bridges.
Subs Not Used: Porter, Smith, Bunce.
Goals: Bridges 35.
Ref: R.T. Hewitt (Spennymoor).