Marcus Rashford scored twice as Manchester United made the perfect start to their Premier League season by inflicting a 4-0 defeat on Frank Lampard in his first match in charge of Chelsea on Sunday.Ole Gunnar Solskjaer’s men were in need of a fast start to the campaign to erase memories of a terrible end to last season and got it, as Rashford’s early penalty and three goals in 16 second-half minutes from Anthony Martial, Rashford and debutant Daniel James had Old Trafford in raptures. Harry Maguire and Aaron Wan-Bissaka also impressed at the back on their debuts after United spent £130 million ($156 million) on the pair over the summer to shore up a defense that conceded 54 Premier League goals last season.However, questions will be asked of Chelsea’s decision to let experienced defender David Luiz leave to join Arsenal earlier this week as the Blues struggled to contain the United counterattacks despite dominating long spells. Pierre-Emerick Aubameyang fired Arsenal to a 1-0 win at Newcastle in their Premier League opener on Sunday, providing hope of an improved run this season for Unai Emery’s side.The Gunners finished last season in turmoil after blowing their bid for a top-four place with a disastrous spell in the final weeks. Adding to Emery’s woes, Arsenal were crushed by Chelsea in the Europa League final to shatter their dreams of Champions League qualification.But Arsenal have enjoyed a profitable close season, with a host of new signings raising morale around Emirates Stadium.And Aubameyang gave Arsenal fans renewed belief they can get back in the top four this term with a typically predatory second half finish to give the north Londoners a winning start.Lampard’s first team selection was a bold one as he put his faith in youth with Tammy Abraham and Mason Mount handed starts, while £60 million signing Christian Pulisic was made to wait for his Premier League debut on the bench.And Chelsea started the better as Abraham smashed a shot from the edge of the box off the post.However, the heart of the Chelsea defense always looked fragile.Kurt Zouma had already gotten away with gifting possession to Martial on the edge of his own box as the Frenchman shot weakly into the arms of Kepa Arrizabalaga before he was turned easily by Rashford and hauled the England striker to the ground.Rashford dusted himself off to blast the penalty high past Kepa to open the scoring and United fed off the momentum of the goal for a spell. Yet, Chelsea steadied themselves as the first half wore on and should have at least been level by the break.David de Gea was forced into a fine save with his feet to deny Ross Barkley before left-back Emerson Palmieri also blasted off the inside of the post.De Gea was at fault with a series of high-profile errors toward the end of last season, but the Spaniard — handed the captain’s armband in the absence of Ashley Young — looked back to his old self as he beat away another two powerful drives from Emerson after the break.And at the other end, Rashford and Martial provided the clinical touch to kill the game off in the space of 60 seconds that Chelsea lacked.Maguire showed his presence to outmuscle Abraham on the edge of the United box and set off a flowing counter-attack that ended with Martial bundling the ball home at the far post from Andreas Pereira’s cross.Paul Pogba then played provider with a brilliant ball over the top for Rashford to burst in behind before coolly slotting past Kepa.Pogba was the creator again for the fourth as the Frenchman played a 1-2 with Rashford and powered through the Chelsea defense before laying off to James, who got the benefit of a big deflection to find the bottom corner.