No shortage of subplots in chase to dethrone City

The Premier League roars back into action on Friday after another frenetic summer of transfer spending in the world's richest soccer league.

Champion Manchester City is favored to become the first side in a decade to retain the title, but hopes are high that Liverpool can end a near three-decade wait to win the league.

Chaotic offseasons for Manchester United and Chelsea could undermine their challenge, while there is an air of optimism for a new era at Arsenal.