Pep Guardiola emerged victorious from his first Premier League battle with old adversary Jose Mourinho as Manchester City secured a fully deserved win in a frantic Old Trafford derby. Santi Cazorla's stoppage-time penalty gave Arsenal a dramatic victory over a determined Southampton side. Callum Wilson's superb late goal earned Bournemouth victory over West Brom, their first Premier League win of the season. Robert Snodgrass scored a 95th-minute free-kick to rescue a point for Hull City in the Premier League at Burnley.