Duke's Patrick Ngongba II unlikely to play in NCAA Tournament first round vs Siena

Duke enters the 2026 NCAA Tournament as the overall top seed, but the Blue Devils will likely do so without starting center Patrick Ngongba II against Siena in the first round. Ngongba II suffered an injury in the lead-up to tournament play, and Duke head coach Jon Scheyer confirmed in Thursday's pre-tournament availability that the center's status remains uncertain for Thursday's game. The nature and specific location of the injury has not been publicly disclosed beyond general availability designations.

Ngongba II has been one of Duke's more reliable interior contributors this season. As a 7-foot-1 center, he provides the size and rim protection that Duke's perimeter-heavy roster relies on when opponents attack the basket. His absence does not make Duke beatable in a conventional sense against a No. 16 seed, but it changes the team's physical profile in ways that become more consequential as the tournament progresses and the opponents get better.

What Ngongba II does for Duke's interior defense

Duke ranked 12th nationally in adjusted defensive efficiency according to KenPom's final regular season ratings, with Ngongba II's presence as a rim deterrent contributing significantly to that number. He averaged 1.9 blocks per game this season and his block percentage of 7.4 percent was in the 87th percentile among all college centers, meaning he alters shots as much as he blocks them outright. Teams that have scouted Duke for potential tournament matchups have already noted his absence as a variable in their preparation.

The depth question behind Ngongba II is real. Duke's next available big man, sophomore Aidan Mahaney, has logged significant minutes this season but does not match Ngongba II's length or shot-blocking frequency. Mahaney averaged 0.7 blocks per game in limited post time and projects more as a switchable defender than a traditional rim protector. Against Siena that difference barely registers. Against a second-round opponent with a capable interior scorer, it matters considerably.

How Duke typically adjusts when playing without a true center

Scheyer's Duke teams have shown a willingness to go small when circumstances require it. The 2024-25 Duke squad played meaningful stretches of the ACC season without a traditional post presence and compensated by running more pick-and-roll actions, spacing the floor with four shooters, and asking guards to take on more defensive rebounding responsibility. That adjustment works against smaller opponents but tends to struggle when a team has a physical centre who can dominate the offensive glass.

Cooper Flagg, Duke's top NBA Draft prospect and the team's leading scorer at 18.6 points per game, can absorb some of the interior load when Duke plays smaller. At 6-foot-9, Flagg has the athleticism to defend stretch fours and some traditional post players, and his baseline defensive instincts allow Duke to hide some of the size disadvantage. But asking Flagg to take on additional defensive assignments increases his physical workload across a six-game tournament run, which is a factor Scheyer will be managing carefully.

Why Siena's game plan likely does not change

Siena is a No. 16 seed from the Metro Atlantic Athletic Conference. Their path to an upset of Duke, even without Ngongba II, would require one of the least likely outcomes in tournament history. No. 16 seeds are 1-140 all-time against No. 1 seeds in the Round of 64, and the one exception, UMBC over Virginia in 2018, involved a Virginia team that was historically slow-paced and vulnerable to the specific style of play UMBC ran. Siena's profile does not match the characteristics of a team capable of executing that kind of upset.

That said, a competitive first-round game rather than a blowout would serve Ngongba II's potential return better. If Duke is required to exert themselves fully against Siena, the coaching staff has less ability to hold Ngongba II out of first-round action as a protective measure and still feel confident about the team's depth heading into the second round.

The second-round implications if Ngongba II remains out

Duke's potential second-round opponent will come from the No. 8 versus No. 9 game in their East Region bracket. The winner of that game will have watched Duke's first-round performance specifically looking for evidence of how the team manages interior minutes without Ngongba II. Any second-round team with a productive centre will have had two full days to install a game plan targeting that gap before the teams meet Saturday.

Scheyer said Thursday that the team will reassess Ngongba II's status daily and that there is a possibility he is available at some point during the tournament depending on how the injury responds to treatment. The timeline for a potential return is not public, but Duke's Sweet Sixteen game, if they advance, is scheduled for March 26 at the Prudential Center in Newark, New Jersey, which gives approximately ten days from the first-round game for additional recovery time.