Launceston schools sent a state tournament favourite crashing out of the State High School Championships.
Marist Regional College entered the Tasmanian titles the number-one seed in the senior boys division.
But upset losses to Queechy High School and Riverside High School has ensured the Burnie rival has now failed to reach the semi-finals on Sunday.
Marist had effectively ended their campaign on the opening day with a 0-3 win/loss record.
The boilovers has ensured Riverside (2-1) qualified for the last four after the school only qualified third in the North.
Queechy High are set to top the group following three straight wins.
Hobart’s New Town High School are also undefeated.
St Patrick’s College Launceston will now face off against Wynyard High School for the last semi-final spot on Sunday.
Wynyard High proved the dominant team in the senior girls division on Saturday, registering three wins from three encounters.
But it took Wynyard to win a thrilling 43-42 game against MacKillop Catholic College to seal top spot heading into semi-finals.
MacKillop’s only loss in three games failed to affect the Hobart school’s chances of reaching the last four.
Sacred Heart (2-0) are assured to join Wynyard and MacKillop on Sunday after inflicting the first defeat on St Patrick’s College.
The North and South top-ranked schools have remained undefeated in the junior boys division.
Riverside High School sit with a 3-0 record and St Virgil’s College Hobart are 2-0.
But the two schools now will meet in what is effectively a semi-final rubber.
St Brendan-Shaw College Devonport (2-0) and New Town High (2-1) also clash to reach Sunday’s final.
St Brendan-Shaw top the junior girls division with three consecutive wins.
Marist Regional College and Launceston Church Grammar (both 2-0) will join the Devonport school in the semi-finals.
Riverside High School will face Ulverstone High School in a cutthroat group game to also reach the last four.
Basketball Tasmania’s chief executive Chris McCoy watched the proceedings from Elphin Sports Centre to keep an eye on burgeoning Tasmanian talent.
McCoy has been fascinated watching elite players team up with less-fancied school mates.
“A lot of our program players are playing and this is a good chance as a different sort of competition,” he said.
“A school might have a few players who may play representative basketball and then they have a few that just don’t.
“So it’s a good test.”