Cameron Stewart scored twice and Tyreece Simpson once as Town’s U23s defeated Watford 3-0 at Playford Road.
Northern Irish U19 international centre-half Stewart nodded a Harley Curtis cross home in the 40th minute to give Kieron Dyer’s side the lead, then added the second with another header two minutes after half-time.
Simpson, netting his first U23s goal since making his return from his loan spell at Swindon, made it 3-0 on 59 from a Cameron Humphreys pass.
Skipper Elkan Baggott came close to adding a fourth in the dying seconds but the Hornets keeper clawed the ball away when it looked destined for the top corner.
The young Blues, who remain second in Professional Development League Two South, have won their last five and are unbeaten in their last eight.
Town: White, Stewart, Baggott (c), Armin, Curtis, Alexander, Humphreys, Smith, Chirewa, Hughes, Simpson. Subs: Bort, Agbaje, Yengi, Bello, Manly.