LaMelo Ball became the youngest player in NBL history to record a triple-double and emphasised his claims to be the No.1 overall NBA draft pick in 2020.
Ball's game-high 32 points, 11 rebounds and 13 assists helped Illawarra beat Cairns 114-106 in overtime at the WIN Entertainment Centre.
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The 18-year-old's game-tying three-pointer with six seconds remaining on Monday night sent the contest to overtime with scores locked at 99-99.
He then played his part in overtime to get the Hawks home.
"Pretty much I just believe in myself and my confidence levels is just really high," Ball said of his performance.
"So every shot I take I feel like it's going in.
"I try to improve every day, pretty much, and just work my hardest."
Californian Ball is on a two-year deal with Illawarra as part of the NBL's Next Stars program, which was launched in March 2018.
Under the program, the NBL contracts young overseas players - like Ball and New Zealand's RJ Hampton - and fast-tracks their development to give them the best chance of being drafted into the NBA which does not allow players straight out of high school.
Ball originally intended to play college basketball at UCLA but concerns about NCAA eligibility rules prompted his Australian move, though an NBA clause in his contract is expected to see him depart after one season.
Hawks coach thrilled for NBA prospect Ball
Illawarra coach Matt Flinn heaped further praise on Ball after a record night for the rookie.
"I think everyone saw tonight what he's capable of," Flinn said.
"We see it pretty regularly in practice when the doors are closed but it was really nice for him to get into a flow.
Lamelo Ball is exceeding the hype - what a performance and what a game. #LetsGoHawks— Brad Walter (@BradWalterSport) November 25, 2019
What a performance by Lamelo Ball tonight👏🏻🔥awesome night of @NBL hoops! This kid is legit.— Shane Heal (@ShaneHeal) November 25, 2019
LaMelo Ball did this with Mitch Kupchak on hand in Wollongong. His impact was felt all over the floor while shooting 7-of-13 from 2, 4-of-7 from 3. Large contingent of NBA scouts expected to head over to see Ball take on the New Zealand Breakers and RJ Hampton later this week.— Mike Schmitz (@Mike_Schmitz) November 25, 2019
"He just impacts the game in so many different ways. It's exciting to be a part of and it's also the way he brings his teammates into the game as well.
"There's so many good players in this league but the really great ones make everyone around them better and I think we saw tonight he can bring other people into the game."
Tim Coenraad (27 points), Sunday Dech (15), AJ Ogilvy (11) and Todd Blanchfield (10) all reached double-figures for the Hawks as they recorded just their third win of the season.
DJ Newbill contributed 27 points, three rebounds, five assists and three steals for the Taipans.
Fellow US import Scott Machado scored 22 for the Taipans, while Majok Deng chipped in with 19 points and six rebounds.