William Ferreira scored a last-gasp equaliser to earn Bolivar a valuable 1-1 away draw against Lanus in the first leg of the Copa Libertadores quarter-finals on Thursday.
Oliver Benitez put Argentinian side Lanus ahead early on after converting Diego Gonzalez's pass and the reigning Copa Sudamericana champions came close to doubling their lead only to see visiting keeper Romel Quinonez keep out Victor Ayala's free-kick, with Marcos Astina contriving to but the rebound over the bar with the goal at his mercy.
That miss could end up costing Lanus dear as Bolivian side Bolivar grabbed a vital away goal when William Ferreira drilled home in stoppage time.
Lanus boss Guillermo Barros Schelotto said: "We had clear chances for a 2-0 win. It seems to me to be unjust, the one that fought to win was Lanus. It's a situation that we must overcome to reach the semi-finals. We will try to win."
In the other quarter-final first leg to take place, Uruguayan side Defensor Sporting have one foot in the semi-finals after earning a 2-0 away win at Colombian giants Atletico Nacional.
Nacional should really have been in a much stronger position heading into the second leg but failed to make the most of their first-half domination before striking the woodwork twice at the start of the second half through Juan Valencia and Edwin Cardona.
Defensor took full advantage of those let-offs by taking the lead through midfielder Leonardo Pais's header in the 77th minute before Nicolas Olivera added a second six minutes later.
To cap a miserable night for Nacional, they saw Cardona sent off with five minutes for elbowing an opponent.