Marin also grabbed an assist in a 4-2 victory over the MLS side and the former Werder Bremen star was pleased to make an immediate impact.
He told Chelsea's official website: "Of course it was a nice feeling to score in the first game and to have an assist too, and I am happy with my performance.
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Despite an impressive start to pre-season the German insisted that preparations are far from complete as the Blues look to break back into the Premier League's top four and defend their Champions League crown.
He added: "We've trained every day and we have been doing possession games but of course not everything is good. We have to work a lot more on these things but I think it will be good."