José Javier "Chucho" Acasuso (Spanish pronunciation: [xoˈse xaˈβjeɾ ˈtʃutʃo akaˈsuso]; born 20 October 1982) is a former professional male tennis player from Argentina.

10 player Félix Mantilla in the last round of the qualifying to make the main draw, and then defeated compatriots Franco Squillari in the quarter-finals and Gastón Gaudio in the semi-finals.

After the previous two successful years, Acasuso's results began to decline and he ended up spending more time out due to injuries.

He also improved his results away from his favoured clay surface by making the quarter-finals on hard courts in Cincinnati and on carpet in Basel.

In 2006, Acasuso won his third ATP title in Viña del Mar over Nicolás Massú and also made his debut for Argentina in the Davis Cup against Sweden in the singles.

After reaching his first Tennis Masters Series semi-final in Hamburg, where Acasuso defeated Simon Greul, Ivan Ljubičić, Sébastien Grosjean, and Fernando Verdasco, before losing to Radek Štěpánek in straight sets, he was ranked inside the top 30 for the first time in his career.

[1] Acasuso was a late substitute for Juan Ignacio Chela in the deciding fifth rubber of the 2006 Davis Cup Final against Marat Safin of Russia.

He replaced an injured Juan Martín del Potro and was defeated by Fernando Verdasco of Spain in a five-set match.