Martinez, Aguero goals send Argentina into Copa America quarters
Already-qualified Colombia beat Paraguay 1-0 in the other Group B match to secure a place in the last eight for both Peru, who finished third in Group A, and Uruguay, currently second in Group C.
Argentina, who finish second in Group B behind Colombia, will play Venezuela in the quarter-finals, while tournament debutants and guests Qatar are out.
Paraguay, on two points, must wait and see what happens in Monday’s Group C clash between Japan and Ecuador before finding out if they qualify as one of the two best third-place finishers.
Peru, with four points, are sure of that while only a draw between Japan and Ecuador would see Paraguay progress.
Argentina coach Lionel Scaloni recalled Manchester City forward Aguero for the crunch tie while Martinez kept his place at the expense of Angel Di Maria.
Asian champions Qatar made a calamitous start when a weak headed clearance from Tarek Salman fell to Martinez 12 yards out, but the Inter Milan forward sent his volley over the top.
He didn’t have to wait long for another chance though as Bassam Hisham played a suicidal ball across his box and straight to the feet of the Argentina forward, who scuffed a shot into the bottom corner after just four minutes.
The weight was lifted from Argentina’s shoulders and they played with a freedom expected of a side boasting talents such as Aguero and five-time Ballon d’Or winner Lionel Messi.
Qatar played with limited ambition but their talented forwards looked dangerous when they did venture into the final third.
Hasan Khalid Al Haydos got in behind the Argentina backline and tried to chip Franco Armani but the goalkeeper got a touch to divert the ball behind, although the linesman’s flag was up and it wouldn’t have counted.
Messi burst into life with an acceleration towards Qatar’s area before slipping a pass to Aguero, who dragged his left-footed shot wide under pressure.
– Aguero industry rewarded –
Qatar were sporadically dangerous on the break and Portuguese-born Ro-Ro stole in at the back post to meet a Karim Boudiaf cross but couldn’t direct his volley on target.
Up the other end, Nicolas Otamendi headed over from close range when it looked easier to score.