On 16 April 2018, following an incredible season in UAE Pro-League, Berg was twice on target as his club advanced to the last 16 stage of the AFC Champions League with an emphatic 4–1 rout of Qatar's Al Rayyan SC. On 21 April 2018, Al Ain were crowned UAE Pro-League champions for the 13th time in their history thanks to a Marcus Berg's hat-trick in an emphatic 4–0 win over Al Nasr. On 29 April 2018, netting four goals in a glorious 5–0 home win game against Al Dhafra FC, helping his club to win the 2017–18 UAE Pro-League, being the top scorer of the League in his first season.