Tony Allen lunged for a steal and missed as momentum took him toward midcourt and out of the play.

His Grizzlies teammates then began to scramble to cover the potential gaps in their defense. And they did just that until Allen recovered, flew toward the basket and recorded a block on a would-be layup.

Whenever the Portland Trail Blazers thought there was daylight on offense Tuesday night, the Grizzlies pulled a shade before leaving the Rose Garden with a 102-97 victory.

Hardly anything was rosy for the Blazers against a Grizzlies’ defense that didn’t seem to relax on many possessions. Just ask the Blazers and their incredibly shrinking shooting percentages from quarter to quarter.

Portland began the night shooting 45 percent in the opening period. The Blazers made 39 percent of their shots in the second and only connected on 22 percent in the third.

The Blazers were shooting just 36 percent for the game when Memphis took a 68-58 advantage into the fourth quarter. Portland did manage to manufacture 39 points in the final period.

Still, the Grizzlies ability to guard the basket consistently through the first three periods allowed them to earn a fifth straight victory and their 13th win in the past 14 games.

Point guard Mike Conley finished with a career-high 15 assists as the Griz improved their record to 43-19.

Portland threatened a few times but Memphis responded.

The Griz didn’t overwhelm the Blazers with offensive execution but kept a comfortable cushion with clutch baskets. Conley scored off the glass on a driving layup that gave the Griz a 91-84 lead with 58.8 seconds left.