BALTIMORE — The best player in the N.F.L. this season also has an 0-2 career playoff record. But nobody needed to explain that to Lamar Jackson in the wake of the startling upset loss by the Baltimore Ravens to the Tennessee Titans, 28-12, on Saturday night.

Jackson knew he would face questions about that as he met reporters near the dispirited, unsettled Ravens locker room. Jackson had spent the previous week insisting that his clumsy, error-filled playoff debut last season was irrelevant to Saturday’s matchup with the Titans. It was an apt and worthy appraisal. A year ago, Jackson had been a rookie with only seven career starts when he imploded with three turnovers in a playoff loss to the Los Angeles Chargers.

But on Saturday, Jackson, 23, all but replicated that performance, throwing two interceptions and fumbling once. The most unstoppable force in pro football during the regular season, the prohibitive favorite to win the league’s Most Valuable Player Award, made misplay after misplay. At the most pivotal moments — like on two fourth-down plays where a yard or less was needed for a first down — Jackson kept the ball himself and could not gain the necessary yardage.