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Teenage midfielder Alexis Mac Allister scored one goal and set up another as Argentinos Juniors upset Superliga Argentina leaders Boca Juniors 2-0 here. Mac Allister gave the hosts the lead in the 10th minute when he side-footed in a Javier Cabrera cross at the Diego Armando Maradona Stadium here on Monday, reports Xinhua news agency. The 19-year-old then laid off a deft side-rule pass that gave Damian Batallini the easiest of tap-ins just after the hour mark.