All Blacks and Crusaders flyhalf admitted that they had paid special attention to their defence in preparation for their clash with the Blues.
The Crusaders outscored the Blues by two tries to one in their 21-13 victory over Auckland's Blues in Christchurch.
Fijian international Nemani Nadolo scored a try in each half for the Crusaders while the Blues only try came from an intercepted pass from scrumhalf Andy Ellis by Frank Halai who ran 95m to score.
Halai went untouched in his race to the tryline but had to leave the field shortly after scoring having injured his ankle in the sprint.
Carter was playing in his second match this season as he was on sabbatical in the first half of the year and while he is still looking for his best form his offload set up Nadolo's second try.
"It was a hard-fought game tonight and we were pleased to get the win," said Carter after the match.
"The Blues really turned up to play."
"They are an extemely dangerous side with a lot of X-factor and we worked hard on our defence to make sure we nullified that and we did.