Last season, it took Young four overtimes to top Bolingbrook in a Class 4A supersectional.
On Monday, in the teams' seventh postseason meeting, the defending 4A champion Dolphins needed just one extra period in a 61-60 victory against the Raiders that punched their ticket to the state semifinals, the program's eighth appearance in nine years.
Young led by double-digits for most of the first three quarters at Hinsdale Central before .
Khaalia Hillsman scored nine points in overtime. She capped a frenetic final 10 minutes with the winning layup with eight seconds left. Linnae Harper preserved the victory with a steal at halfcourt.
"We wanted this so bad and Bolingbrook was playing so strong, but we have a lot of fight and I knew how hard we've worked and didn't want us to lose," Hillsman said.
The Dolphins (28-4) extended their winning streak to 10 and their state semifinal appearance streak to six, setting up a showdown with Marian Catholic at 8:15 p.m. Friday at Redbird Arena in Normal.
Young's Taylor Brame scored 11 quick points to hand the Dolphins a 17-4 lead.
"We have a lot of confidence in our frontcourt," Harper said. "They played great and opened up a lot of things for the guards."
Bolingbrook (24-6) fed off its defensive pressure to kickstart an 18-2 run that tied the score at 46-46 following two free throws by Kennedy Cattenhead. The Raiders had an opportunity to win the game in regulation, but couldn't get a shot off before the buzzer.
Player of the game: Khaalia Hillsman, Young, 12 points, 5 rebounds, 3 blocks.
Key performers: Bolingbrook — Amarah Coleman, 14 points, 7 assists; Kennedy Cattenhead, 13 points. Young — Linnae Harper, 26 points, 12 rebounds, 5 assists; Taylor Brame, 13 points, 6 rebounds.