Agustin Mazzilli and Gonzalo Peillat scored a brace each to help Olympic champions Argentina eke out a 4-3 win over Spain.
World number eight Spain gave Argentina, ranked second, a run for their money in the high-scoring Pool A match that produced end-to-end hockey.
The Los Leones had to dish out every trick from their arsenal to get the better of a fighting Spanish side, which matched their rivals in every department throughout.
The match was fast paced and the scoreline actually captures the intense battle that spectators witnessed in the stadium.
