CEDAR PARK, Texas -- Senior Jonquel Jones scored 23 points, including the go-ahead bucket, and grabbed a school-record 26 rebounds to lead the No. 24/23 George Washington women's basketball team to a thrilling 81-77 double-overtime victory over No. 25/21 Iowa on the second day of the Lone Star Showcase at the Cedar Park Center on Friday afternoon.

GW improves to 5-1 for the first time since the 2007-08 campaign while handing Iowa (5-1) its first loss of the season. The win is the Colonials' first over a ranked opponent since beating No. 21 Dayton on March 1, 2014.

Jones, a preseason Wooden Award candidate, had a double-double midway through the second quarter, and she added four blocks, three assists and two steals in the game. Her 26 rebounds broke Marise James' previous single-game mark of 25, which had stood since 1976. It marks the 11th 20-rebound game in program history and the first since Jessica Adair had 21 against Boise State in the 2007 NCAA Tournament.

Sophomore Brianna Cummings scored a career-high 13 points off the bench, while junior Hannah Schaible contributed 12 points. Junior Caira Washington and graduate student Lauren Chase gave GW five players in double figures with 11 and 10 points, respectively.

Iowa held a 51-44 lead after three quarters, but the Colonials scored 15 straight points to start the fourth period, seizing a 59-51 advantage with 4:32 remaining. GW made 7-of-10 shots in that stretch. The Hawkeyes countered with a 13-5 run and forced overtime with a basket by Chase Coley with 28 seconds left that tied it at 64-64.

Iowa took a three-point advantage early in the first overtime before Cummings and Schaible combined to make 3-of-4 free throws to tie it up. The Hawkeyes regained the lead on another layup by Coley with 35 seconds left, but Jones tied it at 69-69 with a layup of her own with 21 seconds remaining to send the game to a second overtime.

The Hawkeyes twice took two-point leads in the second extra session, but Cummings tied it at 73-73 with 2:18 left and Jones put the Colonials on top for good with back-to-back jumpers, which built a four-point margin with 43 seconds to play. Senior Alexis Chandler then sealed the victory with a pair of free throws and a layup in the final 30 seconds, countering two Iowa foul shots and another bucket by Coley.

The first half featured 11 ties and five lead changes as Iowa held a 17-15 edge after one quarter and a 35-32 advantage at the break. The Hawkeyes built an 11-point lead with an 8-0 run over the first 2:19 of the third period before the Colonials began to chip away.

GW outrebounded Iowa, 50-35, including 19-7 on the offensive glass. The Colonials also held a 40-24 advantage on points in the paint.

GW shot 42.3 percent (33-of-78) from the floor, including 75 percent (9-of-12) in the fourth quarter and 46.2 percent (6-of-13) in overtime. Iowa shot 43.3 percent (26-of-60) in the game but made just 4-of-15 from the field in overtime.

Coley led the Hawkeyes with 22 points on 8-of-12 from the floor and added 10 rebounds for a double-double, while Ally Disterhoft had 19 points and five assists.

The Colonials conclude play at the Lone Star Showcase on Saturday at 2:30 p.m. ET against Wright State.