Former Spitfire Jamie Collins fired the only goal of the game as Sutton secured their first success of the season with a 1-0 home win against Eastleigh on Tuesday night.
Sutton midfielder Collins converted a 31st-minute penalty after Tom Bolarinwa had been brought down in the area, but both sides struggled to create clear first-half chances in what was a frustrating night for Eastleigh.
Defences continued to dominate after the interval and the next clear-cut effort did not arrive until the 84th minute when Sutton defender Dale Bennett fired just wide from the edge of the penalty area.
Eastleigh slipped to a second-straight defeat after their 2-1 home loss to Solihull Moors on the opening game of the season last Saturday.
The Spitfires take on Barnet away on Saturday as they look to get their first points of the season.