Arsenal battled to a 0-0 draw away at Atalanta in a tough Champions League opener, and one player was the clear hero of the night. Mikel Arteta’s side endured difficult opposition in Atalanta and were fearing the worst as Thomas Partey gave a penalty away, but goalkeeper David Raya stepped up to save the day with a huge moment. Atalanta striker Mario Retegui stepped up to take the penalty, but Raya went down to his right to save the initial effort, before producing a truly world-class stop as a player attempted to head in the rebound. This came after Raya consulted goalkeeping coach Inaki Cana…