LONDON (Reuters) – New Manchester City signing Erling Haaland marked a fine Premier League debut by scoring in each half as the champions began their title defence with a clinical 2-0 victory over West Ham United at the London Stadium on Sunday. Haaland converted a penalty after 36 minutes and wrapped up the points with a composed finish in the second period to cap an impressive display, with his father and former City player Alfie celebrating in the stands. “It’s nice that he saw both goals as it is a big moment for me as a debutant in this competition,” the 22-year-old Haaland said. “Also no…