The defending champions had to wait until the 88th minute for the winner. Giovani Lo Celso’s shot was saved by Chile’s Claudio Bravo after a Lionel Messi corner kick but Martinez was on hand to fire home the rebound.
The goal stood after a lengthy VAR review for offside.
Argentina top the group with six points after two matches, with Canada in second on three following their 1-0 win over Peru earlier on Tuesday. Chile and Peru have one point each.
Lautaro Martínez made a significant impact in the match between Argentina and Chile during the Copa America 2024. In the 88th minute, he scored a crucial goal, securing a 1-0 victory for Argentina
“These matches are always like this, we have to continue in the same way, treating the matches in this way, as they are all going to be complicated,” Martinez told TyC Sports.