Playing in his first match since being upset in the first round of the Australian Open, the top-seeded Kuerten was ousted in opening round Tuesday at the $425,000 AT&T Cup.

The Brazilian and defending champion had no answer for local favorite Agustin Calleri, who used his home country to his advantage en route to a 6-3, 6-7 (5-7), 7-6 (7-4) upset.

In the first Grand Slam of the year, Kuerten was beaten last month by unknown Frenchman Julien Boutter.

It also was a quick exit for second-seeded Argentine Guillermo Canas, who was beaten by Spaniard David Sanchez, 6-2, 6-3.