Overview:Gary Lineker introduces the best of the action and reaction from the opening day of the Premier League season. Chelsea began their title defence at home to Swansea, who had not won this fixture for 90 years, while an expensively revamped Manchester United side hosted Tottenham. The three promoted sides were all in action: Bournemouth made their top-flight debut against Aston Villa, Norwich welcomed Crystal Palace to Carrow Road, and Watford travelled to Everton.