The sexy tennis drama “ Challengers” won the box office this weekend with $15 million in ticket sales, according to studio estimates. Zendaya and castmates Mike Faist and Josh O’Connor have been on a globetrotting press tour to get the word out about Italian director Luca Guadagnino's original film, which opened in 3,477 locations in the U.S. and Canada. In fact, 55% of audiences said they went to see