Harvard’s defense, rebounding and 3-point shooting overwhelmed Columbia, 99-64, last night in women’s basketball action at Lavietes Pavilion.

The Crimson were led by senior guard Christine Clark with 21 points, while sophomore forward AnnMarie Healy registered her first double-double with 17 points and 10 boards.

“I was really happy with our defense, I thought we really did a good job,” said Harvard coach Kathy Delaney-Smith. “We are trying to be a better defensive team.

“We are focusing on what we do executing the offensive end, making stops on the defensive end and controlling the boards.”

The Crimson (16-5, 6-1) maintained first place in the Ivy League with a half-game lead over Penn. Harvard shot a blistering 58 percent from the field, nailed eight treys and outrebounded the Lions, 50-24. Harvard packed the low post and held the Lions to 33 percent field-goal shooting and enjoyed a 40-14 edge in points in the paint.

Harvard extended its home winning streak to 20 games.

In building a 48-22 halftime lead over the Lions (4-17, 1-6), the Crimson shot a remarkable 68 percent (17-25) from the field, including 7-for-10 from long range.