AFC Telford's automatic promotion chances faded after a defeat at Eastwood Town.
All Eastwood's goals came from corners, Russell Cooke and Adrian Hawes scoring before half-time and Lee Stevenson making it three just after.
Yannick Salem had Telford's best chance but Eastwood were the better side throughout.
A victory for league leaders Alfreton means Telford are now five points behind having played two games more.
Manager Andy Sinton told BBC Radio Shropshire: "They were the better side. They were quicker, sharper and looked like they wanted it more. I'll be demanding a reaction against Corby on Tuesday night."