By Jude Summerfield Manchester United suffered a few self-inflicted wounds on Sunday afternoon as they slipped to a dispiriting 3-0 defeat to Liverpool. It’s now two losses from their opening three Premier League games for Erik ten Hag’s side, who battled for most of the first half before two major individual mistakes gave them a mountain which was simply too massive to overcome. So, after Luis Diaz and Mohamed Salah ran riot at Old Trafford, who were United’s best and worst performers on the day? Thanks to 90min’s player ratings, we’ve got the answers. Man Utd’s best player vs LiverpoolMatthi…