Argentina made a much-changed All Blacks side work hard throughout an entertaining contest at Nelson's Trafalgar Park, with late tries from Shannon Frizell and Jack Goodhue making the 46-24 scoreline look much more flattering for New Zealand.
Sanchez accounted for one of the Pumas' three tries and scored 14 points in total, seeing him leapfrog Felipe Contepomi as Argentina's record point scorer with 655.
The performance came on the back of a 32-19 win over South Africa, and captain Creevy sees definite signs of progress under coach Mario Ledesma.
"The first [half] was really, really fast and I think we struggled with that," Creevy said.
"We feel good, we feel strong, we will continue. We had a lot of opportunities and we had a good result. We need to improve, we are building a good team, good rugby."