Guillermo Barros Schelotto was left rueing Boca Juniors' missed chances as they could only draw with River Plate in the Copa Libertadores final first leg.
Played a day later than initially scheduled due to torrential rain on Saturday, the Superclasico lived up to its billing but Boca could not shake off their determined rivals in a 2-2 stalemate at La Bombonera.
Despite leading twice and having further chances to clinch a first-leg victory, Barros Schelotto's men were frustrated, with their coach now concerned it could cost them.
"We should have won," Barros Schelotto told reporters. "We wasted so many chances, too many.