ORCHARD PARK, N.Y. (AP) _ In the first half, Aaron Brooks looked hesitant. Ricky Williams was nearly invisible. It didn't matter as long as safety Sammy Knight kept getting the ball back for the New Orleans Saints. Knight matched a franchise record with three interceptions, two of which led to 10 points, jump-starting the Saints to a 24-6 season-opening victory over the Buffalo Bills on Sunday. ``That was huge,'' said Williams, who scored a touchdown and rushed for 87 of his 93 yards in the second half. ``Games like that, when the offense struggles, the only thing that kept us in was our defense.'' Just doing his job, Knight said. ``We know they're going to get it going,'' Knight said of the Saints offense. ``We knew after a while our offense would wear them down. And that's what they did.'' Thanks to Knight, the Saints overcame a 6-0 first-half deficit by scoring 17 points in the first 12 minutes of the third quarter. Brooks bounced back from an abysmal first-half performance, completing 18 of 29 attempts and three touchdowns as the Saints won a season opener for only the 10th time in 35 years. The new-look Bills, on the other hand, still have plenty of work to do, losing in rookie head coach Gregg Williams' debut. While Buffalo's newly installed 4-3 defense held firm, quarterback Rob Johnson looked unsettled running the new West Coast offensive scheme. Johnson finished 16-for-27 for 160 yards and threw three interceptions for the first time in his career. Johnson also failed to capitalize on two trips inside the Saints 15, settling instead for rookie Jake Arians' two field goals. ``The thing about the first half was that we didn't score any points,'' Johnson said. As for his three interceptions, Johnson said: ``It is just one of those things. I didn't play well on those three plays and I wish I could take them back.'' Bills deep threat Eric Moulds, limited to just one catch for 34 yards, was quick to criticize Buffalo's new scheme. ``We have to do different things,'' Moulds said. ``I was talking to (the Saints), and they said it was easy to find me. ... We've got to move guys around to show different looks.''