Sydney are one win away from their first NBL championship since 2005 after toppling Tasmania 90-86 in a nail-biting game two of the grand final series.
The Kings, without competition MVP Jaylen Adams who suffered a hamstring injury in game one, came back from a 10-point first-quarter deficit to seal it in the dying stages.
Clinging to a one-point lead, Kings' sharpshooter Dejan Vasiljevic (20 points) stepped up with a three-pointer with 10 seconds left on the clock to seal Sunday's win in Hobart.
JackJumpers' American guard Josh Adams, who had a game-high 36 points, had kept his side within touching distance with two three-pointers under high pressure in the final 80 seconds.
Sydney captain Xavier Cooks was inspirational in the fourth quarter, scoring 11 of his 20 points for the game to go with an equal game-high 10 rebounds.
"The coaches trusted me. (Xavier) told me before the game, you're the one who has to step up," Vasiljevic said.
"I don't shy away from moments like this. We're trying to close it out in game three."
Import centre Jarell Martin also picked up 20 points for Sydney, shooting at an impressive 80 per cent from the field.
The Kings have a 2-0 advantage ahead of Wednesday night's third game in Sydney in the best-of-five series.
They'll be sweating on the fitness of Adams, who didn't travel to Hobart and will undergo further assessment in coming days.
No team has won an NBL championship after dropping the first two games of the grand final series.
"We can't fault anything. They made their shots and we didn't. It is what it is. I'm not upset by any means, or disheartened," JackJumpers coach Scott Roth said.
In front of a capacity home crowd of 4865 at MyState Bank Arena, Adams started on fire for Tasmania, shrugging off a glancing blow to his arm to post 10 points for the opening quarter.
Tasmania, playing in their maiden NBL season, made the most of 10 trips to the free throw line, picking up eight points, to take a 27-17 lead at the first break.
Vasiljevic came to life for Sydney as they surged back into the contest with a run of 14 points early in the second before Tasmania's Jarrad Weeks hit eight points for a 48-44 lead at halftime.
Tasmania took a 70-68 lead into the final quarter.
Sydney coach Chase Buford lost his temper over a call in the third quarter, appearing to put a dint in courtside signage with a kick.
"It was a heck of a ball game. Down the stretch they hit some unbelievably tough shots," Buford said.
"They were up for the challenge. Josh Adams was just a monster."
The Kings last won the championship in 2005 as part of their three-peat and were runners-up in 2006, 2008 and 2020.