Biggest shutout over P4P #1?

Chavez started to win rounds at around the 9th or 10th, and also arguably won the 2nd round, so that wasn't quite a shutout.

Forrest-Mosley 1 is a good example. Mosley was ranked #1 p4p, according to The Ring, and lost almost every round. You could give Mosley a round or two, but it was very close to a shutout.

Toney was ranked #2 p4p going into the Jones fight and was shutout, or nearly shutout.

Trinidad was ranked in the top 2 p4p when Hopkins dominated and stopped him. I gave Tito the first round, no other rounds, and even the first was close.

If not for the 8th round knockdown, then you could argue that Douglas won every round against Tyson.

at Calzaghe-Lacy.