Bueno double lifts San Lorenzo
San Lorenzo took a big step towards maintaining their top-flight status as they won the first leg of their promotion-relegation play-off 2-0 at Instituto.
Instituto, who finished third in the Primera B Nacional, held out until two minutes into the second half, when Carlos Bueno opened the scoring.
Bueno added a second just after the hour to ensure San Lorenzo would take a sizeable advantage into Sunday's second leg.
In the other tie, San Martin San Juan drew 0-0 at Rosario Central, who were fourth in Primera B.