What quarterback guaranteed a victory for superbowl iii?

quarterback Joe Namath

Explanation:

On January 12, 1969, at the Orange Bowl in Miami, the New York Jets of the American Football League defeat the NFL's Baltimore Colts, 16-7, in Super Bowl III—a result considered one of the biggest upsets in sports history. Days earlier, Jets quarterback Joe Namath guaranteed a victory by New York, an 18-point underdog.

pitch- the definition of pitch is as follows:

"the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone."