On November 14, 2011, Espinoza was announced as the new head of Showtime Sports, replacing Ken Hershman. Since his move to Showtime, Espinoza has made boxing a focus of the network. In 2012, he signed Floyd Mayweather, Jr. to a six-fight, multi-year deal. Espinoza was also reportedly "instrumental" in the Floyd Mayweather, Jr. vs. Manny Pacquiao fight. Under Espinoza's supervision, the Showtime-Mayweather deal accounted for the three highest-grossing pay-per-view events in television history — Mayweather-Canelo in September 2013, Mayweather-Pacquiao in May 2015, and Mayweather-McGregor in August 2017. In January 2018, Espinoza was promoted from Executive Vice President to President of Showtime Sports.