Championship strugglers Rotherham United were thoroughly outclassed in the FA Cup third round, losing 7-0 at Manchester City on Sunday. Raheem Sterling starred as Manchester City blitzed Championship side Rotherham United 7-0 at home in the third round of the FA Cup. City, who named a strong team despite their exertions in ending Liverpool’s unbeaten Premier League run last time out, were always in control at the Etihad Stadium on Sunday. Sterling gave City an early lead and they were 3-0 up at the half-time interval with Phil Foden and a Semi Ajayi own goal adding to their advantage. An…