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Tue 03 Mar 2007Chelsea scrape past PortoChelsea 2 Porto 1 (3-2):Michael Ballack earned Chelsea a place in the quarter-finals of the Champions League with a late winner at Stamford Bridge, as Jose Mourinho's former club threatened to dump the Londoners out of the competition after Ricardo Quaresma had given them a precious half-time lead.Arjen Robben restored parity three minutes after the break and Ballack's strike — his first since November — put Chelsea in the last eight.