Manchester United put in the most complete performance of the pre-season so far in the 3-2 win over Real Betis. The attack hummed with Jadon Sancho as a false nine, Amad stole the show and continued his rise into an established first-teamer, and Marcus Rashford’s potential injury was the only dampener on proceedings. Erik ten Hag fielded arguably his strongest side for this one, with Harry Amass being the only academy player in the starting XI, that too only because Luke Shaw isn’t with the team. Most of the youngsters came on in the second half but the way United saw the game off was a credit…