Georgetown (16-10, 6-7 Big East) beat a ranked opponent for the first time since 2017, and second-year coach Patrick Ewing earned his first win against a Top-25 foe in eight tries.
James Akinjo had 10 points and nine assists as the Hoyas ended a two-game slide and beat Villanova at home for the first time since 2015.
Villanova (20-7, 11-3) lost consecutive conference games for the first time since realignment in 2013 - a span of 104 games.
Phil Booth had 26 points, and Eric Paschall added 16 as Villanova lost for the third time in four conference games after starting 10-0 in Big East play. Colin Gillespie scored 13 points after having a career-high 30 in the teams’ first meeting.
The Hoyas took a 42-32 lead into halftime after shooting 7 of 18 from 3-point distance. McClung scored 17 of his 21 points in the first period.
Villanova cut the Hoyas’ lead to 50-43 after Booth hit a 3-pointer, but Georgetown responded with an 8-0 run as a 3 by Govan pushed the lead to 58-43 with 13:13 left. The Wildcats never got closer than nine the rest of the way.
Georgetown shot 51 percent from the field and held Villanova to just 38 percent. The Hoyas’ bench outscored the Wildcats’ subs 22-9. Kaleb Johnson led the way for Georgetown with eight points.
Villanova: After winning the first four regular-season championships in the reconfigured Big East, the Wildcats are now in danger of finishing second for a second straight season after moving one game behind Marquette in the loss column.
Georgetown: The Hoyas have already surpassed last season’s win total of 15 games with five games remaining before the conference tournament. Georgetown finished 5-13 in league play in each of the last two seasons.
Villanova: Completes a three-game trip at Xavier on Sunday.
Georgetown: At Creighton on Saturday.