More anxious moments for Guardiola but Man City pull through

Manchester City manager Pep Guardiola (right) exchanges words with FC Porto boss Sergio Conceicao at the Etihad Stadium. Photo: Martin Rickett/PA 

Man City 3 Porto 1

Pep Guardiola took the first steps on his annual bid to relive former Champions League glories, as Manchester City kicked off with an ultimately comfortable win, although little in this competition is straightforward for club or manager.