A mark of the struggling Spurs defense could be detected Monday when the NBA released its first and second All-Defensive teams.

For the first time since 1998 and only the second time since 1985, no Spurs player was picked for either first or second team in the balloting of the NBA coaches for the league’s best defensive players.

The balloting snapped a 13-season streak for Tim Duncan of being picked on either the first or second team All-Defensive team.

The lack of a San Antonio presence on the roster is a result of the Spurs’ struggles on defense this season. The Spurs permitted opponents to shoot 47.5 percent from the field — the highest ever on a team coached by Gregg Popovich and the highest opponents’ percentage against the Spurs since the 1995-96 season when they allowed 47.7 percent.