Dean Holdsworth faced his brother David for the first time as manager
Newport boss Dean Holdsworth won the battle of the twins as he saw his side beat brother David's Mansfield.
The visitors had the better of the early chances but could not find a way past County goalkeeper Glyn Thompson.
Despite the pressure, the home side took the lead when a Danny Rose shot from 25 yards flew into the top corner.
The Stags had Keigan Parker sent off for violent conduct and the home side also saw Paul Bignot dismissed late on for a second bookable offence.
This match saw some history made as it was the first time twins had managed against each other in the top five divisions of English football.
Newport, who started the season with only three points from their first four games, have now moved up to eighth in the table, their highest position so far.
Mansfield's defeat, their second in three games, sees them fall out of the top five for the first time since mid August.
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