By Brad Sturdy - IlliniGuys Insider/Analyst & Co-Host, IlliniGuys Sports Spectacular
February 5, 2026
The Illini dominated the Northwestern Wildcats 84-44 to move to 20-3 on the season and 11-1 in the Big Ten, with a win streak hitting 12 games as they prepare for a difficult game on Saturday at Michigan State.
The offense has always been sensational, but the defense has seen growth, both individually and as a group. In part 1 of our Northwestern Rewind we will break down the improvements and changes we have seen in this defense throughout the season, and why they are now good enough to win.
Here are the key changes we have seen.
Communication - We Talking ‘Bout Practice
“It’s going to sound very cliche, but it’s practice,” Underwood said after the Northwestern game. “We had so little practice time. That’s where your defensive chemistry comes from, that’s where your communication comes from, where you have to be an elite problem solver.”
We’re going to focus on the communication aspect here. The defensive uptick began after the Nebraska loss at home, where the Illini allowed the Huskers to shoot 56% from 2-point range and 46% from 3-point range in an 83-80 loss at home.
The Illini repeatedly lost men on switches, back cuts, left shooters open, didn’t follow scouting reports and looked lost on defense for much of that game. The Illini had a week of practice after that outing prior to playing Missouri, and it spurred this 12-game winning streak.
Following the Nebraska game the Illini were sitting at 56th in the country defensively and they now sit 20th. Since that game, they are 12th in defensive efficiency and 1st overall in efficiency. Communication is key.
Protecting the Rim At All Costs
When the Illini had Kofi Cockburn manning the middle they were relegated to drop coverage almost exclusively. Prior to Kofi the Illini overplayed everything and tried to force turnovers. The Illini played a similar passive defensive style since Kofi left, and it just hasn’t worked.
New assistant coach Cam Crocker has facilitated some changes as the defensive coordinator, but he had to get buy-in from Coach Underwood. Last fall, I talked to Underwood about the new defensive changes.
“We are working together,” Underwood said. “He is making some tweaks, some things we are using, others we talk about and maybe come up with a different plan, but he has really brought a fresh perspective.”
But it wasn’t until after that Nebraska game that Underwood fully bought in.
“We had to be better,’ Underwood said. “As good as we were at taking away 3’s, there was still something we were lacking. The personnel that we were trying to recruit was going to force us to have to do some of that stuff. A lot of conversations and I was the hardest one to convince. That was probably the most challenging after the Nebraska game here when they torched for like 60% from 2. That’s when I knew we had to commit to it. I had to commit to it. I had to stop barking every time somebody gave up a 3 and they made it. Just understand that for the long term this is what we’ve got to be good at.”
“It was challenging early in the year, but now I’m all in”
Gaps and Stunts
Illinois is much more active in the gaps as people driving down the lane attempt to get to the rim. We have also seen them much more aggressive in their stunting to show out on a shooter forcing him to put the ball on the floor while defenders recover. Perhaps it is just improved individual defense, but it certainly appears that the Illini are better at getting into help position and taking away what the offense wants to do.
With that in mind, since the Nebraska game we have seen opponents have the wrong guys taking shots for them. Obviously, some of that is scouting report but much of it is execution. Against Northwestern you saw Illinois leave non shooters to make it difficult on Martinelli and Reed, the two guys that had hurt them in Evanston. But they didn't double team it was stunting to force them away from taking the open three. It was being in the gap in proper position to take away a straight-line drive to the rim.
All of that together has made this a formidable defense.
Varied Looks
Clearly personnel matters in determining what defensive style that you're going to play, but Illinois has even gone to a zone defense when they have five players 6’6 or bigger, including a pair of 7-footers, on the court. They have switched. They have trapped. They have hedged, they have played drop coverage and they have played zone.
The very looks have helped them become more efficient defensively if for no other reason than to slow the opponent down and make them decision makers. There was a time when one Big Ten coach told me that Illinois ‘is the most difficult team in the league to play, and the easiest team to prepare for.’ That is no longer the case.
Using Their Length
The Illini are the tallest team in Division I, using lineups that often have 4 players 6’9 or bigger. They don’t need to always jump and get out of position on defense, which has allowed them to stay between their man and the basket and use their length to contest shots. Northwestern had just 1 turnover and still scored an abysmal 0.7 PPP, much of that coming late in the game.
This approach has also allowed them to lead the country in fewest fouls. Imagine a team that protects the rim at all costs and yet does not foul at a high rate. From a math standpoint, that is excellent. And that’s what the Illini have done.
Much has been made of the Illini offense and its rank as the top offense in the Ken Pom era, but their foul rate is also a top 5 all time in the Ken Pom era, and in no season would it have been worse than second.
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