Union suffer at All Boys
Union Santa Fe remain without a point in Argentina's Apertura after suffering their fifth defeat of the season.
Matias Donnet gave Union the lead away to All Boys after 19 minutes, but Martin Morel equalised just five minutes later.
Juan Rodriguez put the home side in front on 31 minutes and Ivan Borghello sealed the win early in the second half. Union's misery was completed in the closing stages when substitute Pablo Daniel Magnin was sent off just five minutes after coming on.