Manchester City fought back after a second-half collapse against Southampton to open its title defense with a 3-2 victory against the Premier League newcomers on Sunday.
Substitutes Rickie Lambert and Steven Davis put Southampton 2-1 in front and wipe out Carlos Tevez's opener for City.
But Samir Nasri spared City from an opening weekend upset by scoring an 80th-minute winner following Edin Dzeko's equalizer.
Chelsea had no such troubles overcoming Wigan in Sunday's other match.
New signing Eden Hazard made an immediate impact, setting up Branislav Ivanovic's opener and winning the penalty from which Frank Lampard converted to clinch a 2-0 victory.