Justine Henin was beaten in the second round of the $4.5-million (U.S.) BNP Paribas Open yesterday by Gisela Dulko. Playing in the third tournament of her comeback - following runner-up finishes in Brisbane and at the Australian Open in January - Henin was defeated 6-2, 1-6, 6-4 by the No. 37-ranked Argentine. Dulko, who upset Maria Sharapova at Wimbledon last year, played well and kept the Belgian off balance by varying the pace of her shots. A shaky Henin twice had consecutive double faults in the final set.