Sony Sony's "The Equalizer 2" won the weekend box office with $35.8 million. That's a bigger opening than its 2014 original ($34.1 million). Universal's "Mamma Mia! Here We Go Again" also had a strong opening weekend with $34.3 million. Sequels continue to work like gangbusters this summer. In a surprise outcome, Sony's "The Equalizer 2" took in $35.8 million to win the weekend box office over "Mamma Mia!