Davis was an effective recruiter as a USC assistant coach, bringing one prospect, Angelo Coia to the Los Angeles Coliseum at night, and as the lights were slowly turned off, asked the student to imagine himself playing there before 100,000 people. Coia played for USC and later worked for the Raider front office. When Davis arrived, USC was on NCAA probation for allowing alumni to surreptitiously give money to players, and had not been permitted to play in a bowl game after the 1956 season; these sanctions hampered Davis's first two seasons at USC, 1957 and 1958, during which the team posted a combined 5-14-1 record. The head coach, Don Clark, came to rely heavily on Davis. Clark and Davis hoped that 1959 would bring a conference championship and the chance to play in the Rose Bowl, but in April 1959 USC was sanctioned by the NCAA again, this time for inducing recruits signed by other schools into breaking their letters of intent. Not allowed to play on television, USC won its first eight games before losing to UCLA and Notre Dame. Despite the defeats, the team was Pacific Coast Conference champions, but because of the sanctions could not play in the Rose Bowl. Clark resigned after the season; although Davis put in for the position, it went to another assistant, John McKay, who did not keep Davis on his staff.
