Forest Green Rovers edged past 10-man Nuneaton, who stayed rooted to the bottom of the Blue Square Bet Premier.
Promotion-chasing Rovers, who sit third in the table, took the lead in the second half thanks to James Norwood's strike from the edge of the box.
The visitors saw Gavin Cowan sent off for violent conduct two minutes later and they failed to find a equaliser.
Boro keeper Adam Smith kept the score down with a fine save from Matt Taylor's effort.
VIEW FROM THE DRESSING ROOM
Forest Green Manager Dave Hockaday told BBC Radio Gloucestershire
"In the first half, we just couldn't get going and they did a real good job in stopping us, we have to give them credit for that but we just weren't at it.
"But in the second half, we got ahead and deservedly had some flurries of play. We then made it difficult for ourselves.
"I'm delighted with the result, scoreline and the clean sheet. However, I'm disappointed with the performance, which is something we'll look at to improve.
"In my head I'm in turmoil thinking about how did we play so poorly because our standards have been so high. We'll work hard to put that right.
"I want a better performance, more tempo, intensity and more desire."