World Series of Fighting 4: Spong vs. DeAnda

World Series of Fighting 4: Spong vs. DeAnda was a mixed martial arts event held August 10, 2013 in Ontario, California, United States.

Background
Tyrone Spong and Angel DeAnda were scheduled to fight at WSOF 3, However, on May 1, it was announced that Spong had been pulled from the card due to visa issues. On June 7, 2013, it was announced the bout would take place at this event.

On June 12, 2013, WSOF president Ray Sefo announced he would return to fighting at this event.

Former UFC vet Jared Papazian stepped in for the injured Joe Murphy.

Lew Polley was scheduled to face Hans Stringer in a Light Heavyweight bout on the undercard. Polley, however, showed up 32 pounds over the weight limit at the weigh ins and the bout was subsequently cancelled.