INDIANAPOLIS (AP) Seth Towns is a natural when it comes to staying poised.

So when Ohio State Buckeyes coach Chris Holtmann needed an extra body to fill a key role Friday, he gave the Harvard transfer an opportunity.

Towns took full advantage of it, scoring a season-high 12 points in 11 minutes and making the tiebreaking free throw to start overtime as the ninth-ranked Buckeyes beat No. 21 Purdue Boilermakers 87-78 in the Big Ten Tournament quarterfinals.

Towns scored six points in OT, including a crucial 3-pointer with 2:53 left.

''Seth and I had a conversation last night and I just felt like he was going to play well tonight,'' Holtmann said after earning his 200th career victory. ''I just felt very confident in his mindset where his head was. It's a great, great credit to him.''

The Buckeyes (20-8) may need their graduate transfer to come up big in Saturday's semifinal matchup against No. 4 Michigan, their longtime rival and the Big Ten regular-season champs, especially if Kyle Young is out.

Young matched his career with 18 points in the first half but most of the second half after taking an inadvertent elbow to the head.

Young tried to play but eventually came out and did not return. Ohio State also finished the game without all-conference forward E.J. Liddell, who fouled out after scoring 17 points, grabbing five rebounds and dishing out five assists.

Duane Washington Jr. led Ohio State with 20 points.

For the Buckeyes, it was another harrowing close call. Just 24 hours after Minnesota cut a 14-point lead to one in the final 3 1/2 minutes of Thursday's tourney opener, they blew an 18-point halftime lead.

Towns rescued them.

''Seth is always under control and calm,'' Liddell said, cracking a smile. ''I feel like Seth is always the level-headed one and he made the big plays, the big shots.''

It was a big moment, too. Ohio State had lost both of the other games against the Boilermakers (18-9) and the victory sends them to their first semifinal appearance since 2014.

Trevion Williams finished with 26 points, 14 rebounds and five assists as Purdue's five-game winning streak ended. Jaden Ivey added 19 points.

''It was on us,'' Boilermakers forward Mason Gillis said when asked about the momentum shift in overtime. ''We missed a free throw box out, they get a layup, a runner and a 3 (from Towns) and that's it right there.''

BIG PICTURE

Ohio State: One day after snapping a four-game losing streak, the Buckeyes won another game in less than impressive fashion. Yes, they need to develop a stronger knockout punch to make a deep NCAA Tournament run. What they do have, however, is grit and depth.

Purdue: One of the Big Ten's hottest teams was doomed by a miserable first half in Indy. It's only the second loss the Boilermakers have suffered inside Indiana this season. But now they'll get some extra rest before resuming next week in one of the three Indiana cities hosting tourney action this sesaon.

STAT PACK

Ohio State: Washington also had five rebounds and three assists. ... The victory also gives Holtmann his eighth consecutive 20-win season. The Buckeyes have won 20 in 16 of the last 17 seasons. ... Ohio State was 16 of 18 from the free throw line. ... The Buckeyes lost their only other matchup against Michigan 92-87 in Columbus on Feb. 21. ... Ohio State is now 3-0 all-time at Lucas Oil Stadium, which also hosts the Big Ten football title game.

Purdue: Zach Edey scored 11 points for the Boilermakers. ... The Boilermakers never led in the second half and only tied the score twice, both on baskets from Williams. The first came with 46.5 seconds left and the second, with 9.4 seconds left, made it 72-all. ... The Boilermakers' streak of holding opponents to 72 or fewer points ended at 15.

YOUNG UPDATE

Holtmann did not provide an update on Young's status following the game because he said he hadn't yet talked to the doctors. But when asked about why Young played four more possessions before leaving the game for good, Holtmann he'd take a second look at how it unfolded. ''I'd like to look back and know the exact scenario,'' he said. ''I think initially he said he wanted to play and so we let him. Maybe looking back, I could have pulled him. Maybe I should have.''

UP NEXT

Ohio State: Faces No. 4 Michigan in Saturday's first semifinal.

Purdue: Will wait to see who they play when the NCAA Tournament bracket comes out Sunday.

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