A rib injury has forced Joe Murphy to pull out of his World Series of Fighting 4 bout against John Robles and replacing him in the bout will be former UFC fighter Jared Papazian. 
WSOF officials announced the change on Monday and the new bout will take place on the preliminary card.
WSOF 4 will take place on August 10th from the Citizens Business Bank Arena in Ontario, California and will be headlined by Tyrone Spong meeting Angel DeAnda in a light heavyweight bout.
Papazian (15-10, 1NC) has gone 1-1 since exiting the UFC in late 2012 an was defeated in his last fight against Brandon Bender at Nation Fight Alliance.
Robles (7-1) will be making his WSOF debut in this bout and six of his seven wins have come by TKO/KO. He has won back to back fights and he is coming off a first round knockout victory in March against Steven Barajas at MEZ Sports Pandemonium 8.
The current WSOF 4: Spong vs. DeAnda fight card is below:
Main Card: (NBC Sports Network – 10:30 p.m ET/7:30 p.m. PT)
Tyrone Spong (1-0) vs. Angel DeAnda (11-2)
Marlon Moraes (10-4-1) vs. Brandon Hempleman (9-1)
Ray Sefo (2-1) vs. Dave Huckaba (20-5)
Nick Newell (9-0) vs. Keon Caldwell (9-1)
Tyson Griffin (16-6) vs. Gesias Cavalcante (17-7-1)
Preliminary Card: (WSOF.com – 8 p.m. ET/5 p.m. PT)
Jorge Santiago (25-11) vs. Gerald Harris (21-5)
Antonio McKee (28-5-2) vs. Lewis Gonzalez (8-0)
Lew Polley (12-4) vs. Hans Stringer (21-5-2)
Jared Papazian (15-10, 1NC) vs. John Robles (7-1)
Isaac Gutierrez (5-3) vs. Victor Valenzuela (12-6-2)