Pulled off a wonderful flying save early in the first half to deny Paulinho. Barely troubled in a tense first leg, the ex-Estudiantes man could do nothing to keep out Romarinho's goal.
Was rarely troubled at the back as Boca controlled the tempo of proceedings in the Bombonera; but was as guilty as the rest of the defence when inattention led to what could prove to be a damaging equaliser.
One of the Boca old guard, Clemente was a consistent threat to the Brazilians as he patrolled the left flank. A delightful cross to Viatri in the final seconds deserved to end in a goal.
Tough, incisive and intuitive on the right hand side of defence, the full-back crowned an impressive performance with his first goal in the Libertadores to briefly hand Boca the lead. Great instincts to turn in when everyone had stopped.
Uneven performance in what could be the first half of his football farewell. Generally solid and tenacious as always, but did not react fast enough when Corinthians' counter left the Boca defence badly exposed.
One of the signings of the season in Argentina, Ledesma showed how much he has meant to the Xeneize since signing from Catania with another towering performance. As intelligent distributing the ball as he was strong to win it, and always a threat on the edge of the area.
Always sought out Riquelme to activate their creative partnership in the middle, and though his play was more muted than in other occasions a decent battling performance from the ex-Banfield star.
Impeccable as usual when it came to his dead-ball delivery. Did not, however, take advantage of the possession enjoyed by Boca to punish the visitors, and was caught napping when giving the ball away that led to the goal.
The anchor of the Boca midfield. Somoza was tireless in chasing down every Corinthians soul unfortunate enough to stray into the middle, ensuring that the Argentines controlled the tempo for lengthy spells of the 90 minutes.
Will feel aggrieved that Chicao's hand denied him the chance to open the scoring seconds before Roncaglia did so; but in truth, the Uruguayan powerhouse had few chances in a frustrating evening.
Always a livewire as he marauded across the defence, albeit only occasionally with results. A wonderfully-hit corner led to the only goal for Boca, and generally kept the Timao on the back foot with tireless running down the flanks.
Barely given a save to make across the game, as Boca failed to break through in the Bombonera. Could do little for the game's solitary strike.
Charged with keeping tabs on the tricky Ledesma, the left-back performed admirably to mark the ex-Catania man; albeit at the expense of his own attacking prowess.
Along with his centre-back colleague, guilty of poor marking to allow Boca a crucial opener in Buenos Aires.
Badly exposed in Roncaglia's goal, and could have seen red for a blatant handball on the line that denied Silva in the build-up.
Always equal to the task at the back, both in repelling another cross or set-piece from Roman with his head and in marking the dangerous Mouche throughout.
A bright start to the match, with a handful of passes that threatened and a vicious shot saved from Orion. Less visible as the game continued, but robbed Riquelme in the build-up to the goal.
Typically neat display from the ex-Spartak playmaker, although few of his incisive balls found a successful end due to incessant marking from the home side.
Failed to control the rhythm of the game, and lost the midfield battle to put further pressure on the Timao defence. Not impressive from the Corinthians icon.
Comprehensively bullied out of the game by the more streetwise talents of Somoza and Ledesma, who dominated in the middle of the pitch and denied the Brazil international the chance to shine.
Had little opportunity to make an impact, with a couple of decent runs down the flank the highlights before he was withdrawn before half time for Liedson.