By Matt Hardy Only one club have managed to win three Premier League titles back-to-back – Manchester United, twice – but Manchester City made the perfect start in their bid to be the second club to do so when Erling Haaland became the second City player after Sergio Aguero to score two goals on his league debut. Haaland’s father, former City right-back Alfie, watched on as his son’s brace earned his side a 2-0 win over a sorry looking West Ham at the London Stadium yesterday. After blasting a first-half penalty earned when replacement West Ham keeper Alphonse Areola brought the Norwegian down…