Dries Mertens proved the matchwinner on Sunday.
“Winning here is particularly enjoyable, because Atalanta always caused us problems and we know that we made our fans happy," Sarri told Sky Sport Italia.
“We had some difficulties with this team, so prepared very carefully and had a different build-up to how we usually approach games."
Mertens ended his nine-match goal drought, which had lasted for 910 minutes of Serie A football.
“He had shown some signs of improvement even without scoring goals, so the drought was relative. It was obvious he'd get back to scoring goals eventually."