Georgetown (11-1) methodically dispatched Memphis by 17 on the road, outscoring the Tigers 46-33 in the second half.
In Evanston Northwestern (9-1) scored the game's first 20 points and rolled past Mount St. Mary's, 70-47. John Shurna, the Wildcats' leading scorer, sprained his left ankle in the second half.
Former Maryland Governor Bob Ehrlich was courtside for Princeton's win at Towson.
princetonbasketball.com editor Jon Solomon was a guest on PRI afternoon show Here & Now yesterday. For the 22nd year, Solomon can be heard on 103.3 fm WPRB / wprb.com from 6:00 pm ET on Christmas Eve until 6:00 pm ET on Christmas day playing holiday music you won't find anywhere else.