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Ohio State guard Ameryst Alston, left, drives on Penn State guard Dara Taylor in the second half of an NCAA college basketball game in the quarterfinals of the Big Ten women's tournament in Indianapolis, Ind., Friday, March 7, 2014. Ohio State defeated Penn State 99-82.
INDIANAPOLIS—Ameryst Alston scored 33 points and Cait Craft 24 as eighth-seeded Ohio State stunned top-seeded and No. 11-ranked Penn State 99-82 Friday in the Big Ten Conference tournament quarterfinals.

The Buckeyes (17-17) advance to a Saturday semifinal against Iowa.

Raven Ferguson added 15 points for OSU, which shot 71.9 percent in the first half when it made all 10 of its 3-pointers for a 58-34 lead. The 58 points were a tournament record.

The Lady Lions (22-7) were led by Ariel Edwards' career-high 29 points plus 10 rebounds. Maggie Lucas added 21 points, including a pair of 3-pointers that gave her the conference's career record with 358.

OSU built its lead to 27 points before PSU cut it to nine with 2:56 left.

Penn State forward Ariel Edwards (23) shoots over Ohio State center Darryce Moore in the first half of an NCAA college basketball game in the quarterfinals
Penn State forward Ariel Edwards (23) shoots over Ohio State center Darryce Moore in the first half of an NCAA college basketball game in the quarterfinals of the Big Ten women's tournament in Indianapolis, Ind., Friday, March 7, 2014. ((AP Photo/Michael Conroy))
OSU then went on an 11-2 run to seal the outcome.

OSU's last win over a top-15 team came against Michigan State in the 2011 conference tournament.

Penn State forward Ariel Edwards, right, tries to tie up Ohio State center Darryce Moore in the first half of an NCAA college basketball game in the
Penn State forward Ariel Edwards, right, tries to tie up Ohio State center Darryce Moore in the first half of an NCAA college basketball game in the quarterfinals of the Big Ten women's tournament in Indianapolis, Ind., Friday, March 7, 2014. ((AP Photo/Michael Conroy))

Ohio State guard Raven Ferguson, right, celebrates with Cait Craft as they come off the floor for a time out in the first half of an NCAA college
Ohio State guard Raven Ferguson, right, celebrates with Cait Craft as they come off the floor for a time out in the first half of an NCAA college basketball game against Penn State in the quarterfinals of the Big Ten women's tournament in Indianapolis, Ind., Friday, March 7, 2014. ((AP Photo/Michael Conroy))