Bonano played at Rosario Central In Argentina (1991-1996) and River Plate (1996-2001). In 2001 he left River Plate together with Javier Saviola to FC Barcelona. Baker was the first goalkeeper in his first two seasons at the Catalan club, but in 2003, behind Víctor Valdés and Bonano third goalkeeper Rustu Reçber. The Argentine moved to Real Murcia, where he remained a season. In 2004, Baker contracted by Alavés, with which the goalkeeper in 2005 promoted to the Primera División. In 2008 he stopped playing football.
Bonano came thirteen times for the Argentina national football team in action. He was the third goalkeeper at the 2002 FIFA World Cup qualification.