NEW ORLEANS (AP) - With one obligatory walk-through left before the Super Bowl, the Baltimore Ravens are operating at peak efficiency as they draw closer to Sunday's game against the San Francisco 49ers.

The Ravens breezed through a 65-minute practice session Friday, and afterward coach John Harbaugh could barely contain his enthusiasm.

Asked for his review of the practice week, Harbaugh said: ``It was an A-plus. A-plus-plus. We're at the stage where we're clicking on all cylinders and practicing very, very well. ``

He acknowledged that there were a few assignment errors, but said they were quickly corrected.

Saturday's walk-through will be the last of linebacker Ray Lewis' career. He will retire after Sunday's game.

All 53 players on the active roster participated in Friday's session, which was held at the Saints' training facility.