The third instalment in YA franchise marks 2014’s highest-grossing new opener, but its $123m total is still down on the first and second in the seriesThe Hunger Games: Mockingjay — Part 1 topped the US box office with a gargantuan haul of $123m at the weekend, the highest opening of 2014 so far.Rival studios were unwilling to compete with Lionsgate’s blockbuster sci fi sequel, resulting in no other new films hitting the top 10.