Arsenal progressed to the Champions League quarter-finals last night after beating Porto on penalties in a tense game at the Emirates Stadium. Leandro Trossard’s first-half goal eliminated the deficit from Arsenal’s defeat in the first leg, but it was a night of struggle as Porto made it incredibly difficult for Mikel Arteta’s side to create chances. Arsenal have been scoring freely in the Premier League in recent months, but Porto provided a different test entirely, and it was a fierce battle both on and off the pitch, as Sergio Conceicao came to blows with Arteta. Arteta’s side were far from…