Australia moved to 4-0 and secured first place in Group A with a 65-49 win over the USA as Justin Eveson collected 15 points and 16 rebounds.
Both teams are already assured of their place in the next round, but there was no let-up from Australia as they consigned the Americans to a second defeat of the tournament.
While Australia have little to worry about in terms of their own performances, they are sure to be casting a glance towards Group B, where Canada have emerged as the class of the field helped by Patrick Anderson.
Their 73-66 win over Germany today was not always easy, but Anderson showed once again that he is in the form of his life.
The 33-year-old, who had what Canadian team officials said was his first career international triple-double against Great Britain two days ago, collected another with 25 points, 15 rebounds and 12 assists to power Canada to 4-0, with captain Bo Hedges adding 24 points.
Anderson retired after Beijing 2008, but returned to action last year with the goal of playing in a fourth career Paralympic Games, and he is more than making the hard work pay off so far.
Canada and Germany are both through, but the picture behind them is much more muddled with three teams vying for two places.
Hosts Great Britain put themselves in pole position with an impressive 87-58 win over rivals Poland, while Japan kept themselves in contention by beating Colombia 63-49, eliminating the South Americans.
Britain will advance with victory over Japan tomorrow, but could even go through with a loss if Germany beat Poland and Britain avoid a heavy defeat.
On today's form, that second scenario will not be relevant as they beat Poland, pulling out to a 12-2 lead and never looking back.
Terry Bywater had 22 points with Ian Sagar and Dan Highcock each adding 14, Simon Munn 12 and Jon Hall 10.
Japan comfortably saw off Colombia as Reo Fujimoto scored 21 of his 27 points in the first half, adding 14 rebounds.
Colombia began with a 10-3 start, but had little to shout about thereafter.
In a game between two teams already eliminated from quarter-final contention, Amine Moukhariq added 10 points, while Richard Nortje had 15 for South Africa.
Another outstanding performance from Janet McLachlan led Canada to a decisive 65-51 win over Brazil, eliminating the South Americans from the tournament and sending Great Britain through on the hosts' day off.
McLachlan scored 36 points and collected 23 rebounds for Canada, who improve to 2-1, hot on the heels of Australia at the top of Group A.
Brazil drop to 0-3, and can now do no better than matching the record of Britain, who beat them 42-37 yesterday.
Mexico and Britain join Australia, Canada, Holland, Germany, the United States, and China in securing a quarter-final place.