The Adelaide 36ers and Perth Wildcats momentarily appeared headed for historic wins against NBA teams but the fairytale didn't materialise.
The Utah Jazz overran the 36ers in the final quarter in Salt Lake City on Friday to take a comfortable 129-99 victory.
In Colorado it was a similar story, with the Wildcats pushing the Denver Nuggets before falling 96-88.
"We knew they were going to come out and compete and they did that," said Nuggets point guard Monte Morris, who was full of praise for the Wildcats.
The games were the final instalments of the seven-game NBL-NBA series played across North America and Hawaii in the past week, with the billion dollar-plus NBA franchises victorious against the minnows from Australia and New Zealand.
The 36ers appeared set for a massive upset against an undermanned Jazz.
Adelaide's starters all shot more than 40 per cent from the field for the game and Nathan Sobey top-scored with 25.
The 36ers took a 31-28 lead at the end of the first quarter and stayed close to the Jazz until the fourth quarter.
The Jazz didn't play French giant Rudy Gobert and Australian guard Dante Exum, while Adelaide-raised star Joe Ingles had a poor shooting night, missing all four field-goal attempts.
Jazz coach Quin Snyder sat Ingles and the team's other starters Donovan Mitchell, Ricky Rubio and Jae Crowder in the second half.
The Wildcats, who a week ago were thrashed 130-72 by the Jazz, trailed by just one point late in the third quarter against the Nuggets.
The Nuggets also ran away in the final quarter.
Perth shooting guard Bryce Cotton might receive some interest from NBA teams after top-scoring with 33 points, including sinking five of 10 three-point attempts.
In Friday's other NBL-NBA clash, Melbourne United suffered a similar fate.
They stuck with the Toronto Raptors until midway into the second quarter before the Canadian team dominated the second half to win 120-82 in Toronto.
The Raptors rested stars Kawhi Leonard, Kyle Lowry, CJ Miles and Fred Van Vleet but still had too much firepower for an off target Melbourne United.
Melbourne shot just 35 per cent from the field for the game and 15 per cent from behind the three-point line.
Raptors Australian rookie Deng Adel, who's fighting for a place on the roster, showed off his skills with sweet moves and five-for-five field goal shooting for 13 points in 16 minutes on the court.
United's Chris Goulding had 17 points but hit just two of eight three-point attempts.
United also fell last week to Ben Simmons' Philadelphia 76ers 104-84.
In the other games the past week, the Phoenix Suns defeated the New Zealand Breakers 91-86 and the Los Angeles Clippers beat the Sydney Kings 110-91.
