David Nalbandian has congratulated the winning Argentine Davis Cup team, calling the country's victory a historic achievement.

Nalbandian, who made winning the Davis Cup one of his top career goals—and was on the team when it made the final in 2008 and 2011—watched as his countrymen came from 2-1 down to win a thrilling tie against Croatia. It was the first Davis Cup title for Argentina, which was playing in its fifth final.

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"It was incredible, the whole week—all the matches," the former world No. 3 told TyC Sports.

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He also praised Juan Martin del Potro, who won his opening singles match and came from two sets down to beat Marin Cilic and send the tie into a fifth and deciding rubber. The pair famously clashed during the 2008 final, following Del Potro's decision to play the Tennis Masters Cup a week before the Davis Cup final. But Nalbandian had positive words for del Potro's performance against Croatia.

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"Juan Martin was down 2-0,” the former Wimbledon finalist said. “It was complicated and he played an incredible match. It was an incredible week for the guys … Today they wrote a page in history."

Following Del Potro's victory, the fifth and deciding point was won by Federico Delbonis, giving Argentina the title. Leonardo Mayer and Guido Pella were the other players on the championship team, though Pella didn’t play in Zagreb.