LAWRENCE, Kansas (Ticker) -- Curtis Stinson continued one streak, ended another and strengthened Iowa State's case for an NCAA Tournament bid.
The sophomore guard hit a driving jumper in the lane with 5.1 seconds left in overtime to lift the Cyclones to their seventh straight Big 12 Conference win, a 65-63 upset of second-ranked Kansas.
"When we had the opportunity for the last shot, I told coach 'Hey I've got this one,'" Stinson said. "I was able to get in the lane and hit the shot. When I shot it, it felt like it was going in. Beating the No. 2 team at home, it doesn't get better than that."
Since dropping its first five Big 12 games this season, Iowa State (15-8, 7-5) has beaten four ranked opponents to stake a strong claim for an at-large bid to the NCAA Tournament.
"Not a lot of teams come in here and win, so I am very proud of the players," Iowa State coach Wayne Morgan said. "My hat's off to them for playing with such courage at Allen Fieldhouse."
The loss snapped a 32-game conference home winning streak for the Jayhawks, who will likely drop out of the top five in the polls. Kansas (20-3, 10-2) had won its first 10 conference games this season before losing in double overtime at Texas Tech on Monday.
"We played good at Texas Tech, but we played miserable today with only one guy in double figures," Kansas coach Bill Self said. "We only shot 34 percent at home and had so many unforced turnovers."
The Jayhawks rallied from a nine-point deficit in the final 2 1/2 minutes of regulation and forced overtime when Keith Langford hit a driving shot with 4.8 seconds left. Langford had a chance to force another overtime, but his 17-foot jumper from the left side bounced off the rim with two seconds remaining.
"We fought to get back and get the game into overtime, but we didn't finish it today," Kansas point guard Aaron Miles said.
Stinson scored all seven of Iowa State's points in overtime and finished with 29 points, three shy of matching a career high.
After Jeff Hawkins hit a 3-pointer to give Kansas a 59-56 lead in overtime, Stinson converted a pair of free throws and scored a basket in the lane with 3:42 left.
Wayne Simien made two free throws to give the lead back to Kansas before Stinson made 1-of-2 from the line to tie the game at 61-61 with 3:02 remaining.
Langford could have reclaimed the lead for Kansas, but missed a pair of free throws with 1:33 left.
"All in all, it was just one of those days when things just didn't seem to go right," said Langford, who made 4-of-12 shots from the field and just 1-of-5 from the line.
Fittingly, Stinson gave Iowa State the lead for good with a short jumper over Langford.
"Stinson played as good as I have seen anyone play," Self said. "He deserves to be named to the all league first team. There is not a guard that is more effective one-on-one than him."
"He (Stinson) was the man for Iowa State today," Simien said. "Even when he wasn't scoring, he was getting into the lane and causing havoc. He was definitely the difference in the game for them."
Simien was the only Jayhawk in double figures with 17 points and 11 rebounds.
J.R. Giddens, Kansas' best 3-point shooter, made just 3-of-16 shots from the field, including 1-of-11 from beyond the arc.