F1 summer report card: from top of the class Mercedes to the team that must do better

As Formula 1 heads into its traditional mid-season three-week break, Mercedes have dominated the season with eight wins from 11 races, a strike rate that has exceeded even their own expectations. Their power unit, including the hybrid electrical element, is considered the class of the field, despite an Aduo engine assessment that controversially ranked Red Bull's internal combustion output highest. Young driver Kimi Antonelli appears to be a central figure in the championship battle as rivals look to close the gap on Mercedes during the break.