William Frank Selby (born June 11, 1970 in Monroeville, Alabama) was a utility player from to with the Boston Red Sox, Cincinnati Reds, and Cleveland Indians. Selby played in 198 total MLB games, with a .223 career batting average. Mostly used off the bench, Selby hit a career high 6 home runs in with the Indians. The most dramatic of those home runs came on July 14, when he hit a walk-off grand slam against Mariano Rivera to defeat the New York Yankees, 10-7, in the bottom of the 9th inning. It was the first walk-off home run that Rivera had allowed in his career.
Bill Selby became the sixth player in (Triple-A team) Buffalo Bisons club history to be inducted into the Buffalo Baseball Hall of Fame on August 25, . In the Bisons’ modern era, Selby ranks first in hits (378), doubles (90), RBI (245) and runs (217). He’s second in games played (370) and third in home runs (60). Selby was the team’s MVP in (.295, 20 homers, 85 RBI) and played in the Triple-A All-Star Game in Rochester, New York.
The "Selby is God" fans received some notoriety after Selby's grand slam off Rivera in 2002, appearing in the Cleveland Plain Dealer and on television.
“Texas came to town in 2002 and I was with [former Indian] Lee Stevens on the bench saying, ‘This dude is unbelievable. He’s a real project.’ He was hitting the ball everywhere. We got him the next spring and we called him ‘Project’ all the time. One day I passed him, and said, ‘What’s up, you big donkey?’ He said, ‘Hey, I can’t be the Project and the Donkey.’
“So we started going with ‘Pronkey’. In Spanish, we made it ‘El Pronko.’ Then it got down to ‘The Pronk’ and finally just ‘Pronk.’ It fits him. He doesn’t look like Shrek or anything else. He just looks like a Pronk.”