Guarin pounces to give Porto edge in Iberian battle
Guarin capitalised on a defensive mix-up five minutes from time to give Porto a potentially crucial advantage to take back to Portugal for the return leg.
Earlier, Porto had taken the lead through Jorge Rolando in the 59th minute but that was cancelled out by a Frederic Kanoute header seven minutes later. Rangers were dealt a blow when Matias Fernandez grabbed a late leveller to deny them victory over Sporting Lisbon in the Europa League, drawing 1-1 in Glasgow. Steven Whittaker was on the scoresheet but it was not enough to claim victory at Ibrox.