Diggins scored 15 of the Fighting Irish’s first 23 points, leading them to a 23-10 lead 8:20 into the game.
Kayla McBride added 12 points for Notre Dame (8-1).
Brittany Chambers had 18 points and seven rebounds, for Kansas State (7-3).
NO. 9 MARYLAND 69,
In Newark, Del., Tianna Hawkins had 16 points and 16 rebounds, and Maryland hounded Elena Delle Donne in her return from an illness as the Terrapins (8-2) beat Delaware (5-3).
Delle Donne played for just the second time this season after missing a month with Lyme Disease. She finished with 19 points and six rebounds but was 7 for 23 from the floor in 34 minutes.
NO. 24 WEST VIRGINIA 54
In Morgantown, W.Va., Wumi Agunbiade scored 15 points as Duquesne (10-1) beat West Virginia (7-3) for its ninth win in a row.
Christal Caldwell added 13 points and Ayana Dunning had 10 for West Virginia.
NO. 18 OKLAHOMA 70,
UC RIVERSIDE 46
In Norman, Okla., Aaryn Ellenberg scored 27 points to lead Oklahoma (9-2) over UC Riverside (6-4).
NO. 20 TEXAS 53, CORNELL 40
In Austin, Texas, Imani McGee-Stafford had 20 points and 12 rebounds as Texas (7-2) beat Cornell (5-5).
Nneka Enemkpali had 11 rebounds for the Longhorns and Chassidy Fussell had 10 rebounds.