 Complete the following phrase:  On January 23, 2017, Pulisic signed a new deal with Dortmund which would keep him at the club until 2020. On March 8, 2017, Pulisic scored his first UEFA Champions League goal in a 40 victory over Benfica in the round of 16, making him Dortmunds youngest ever scorer in the competition at the age of 18 years, 5 months, and 18 days. Pulisic also assisted one of Pierre-Emerick Aubameyangs goals in the win, advancing Dortmund to the quarter-finals. On August 5, 2017, Pulisic scored the first goal in the 