Arsenal became the first team to manage one unwanted feat in the Champions League this season. Arsenal struggled to get into any kind of rhythm as they took on Porto on Wednesday evening. This was partially due to the fact that the game was so regularly broken up by the sound of the referee’s whistle. The man in the middle, Serdar Gözübüyük, was certainly in no mood to let the match flow. Of course, this is not the only reason why Mikel Arteta’s side slumped to a 1-0 defeat at the Estadio do Dragao. Their performance was generally below par. Gabriel Martinelli had a tough time in particular. M…