Derek Fisher emerged from a meeting with NBA officials and, as he has all summer, reported no breakthrough on a new labour deal.
Do that again on Monday, and the start of the season is expected to be called off.
Negotiators for owners and players will meet again on Monday, the deadline Commissioner David Stern set for when there must be a deal to avoid cancelling the first two weeks of the regular season, scheduled to begin November 1.
The two sides met for more than five hours on Sunday, but didn't even touch perhaps the biggest issue dividing them.
"We're not necessarily any closer than we were going in tonight, but we'll be back at it tomorrow and we'll keep putting time in," said Fisher, the union president.
Neither side offered any specifics, but a person with knowledge of the talks told The Associated Press that they did not discuss the split of revenues. The person was granted anonymity because the details were supposed to remain private.
When they last met on Tuesday, league officials asked the union if they would consider a 50-50 split of basketball-related revenues. The players, guaranteed 57 percent under the previous collective bargaining agreement, rejected that and said they were not prepared to go below 53 percent.
The salary cap system is the other big issue remaining. Numerous other items remain untouched because the negotiators have spent so much time seeking compromise on the main two.
Fisher also said the union would postpone a regional meeting scheduled for Monday in Los Angeles so he and other officials could remain in New York for more talks. He and executive director Billy Hunter had been scheduled to fly out in the morning, and he had sent a letter to players encouraging them to attend for an update on the negotiations.
"We feel like our time, and our guys would want our time, to be used in meeting and try to get closer to getting a deal done," he said. "So instead of going forward with that meeting, we're going to put it off and then we'll reschedule it accordingly depending on what happens tomorrow and into the week if we continue to meet."
No further talks had been expected this weekend. On Friday, a person close to the union told AP that players had been seeking a session before the deadline, but were told it came with a precondition of agreeing to the 50-50 revenue split.
The NBA later confirmed it wasn't prepared to move above a 50-50 split but still was open to discussing other issues, but that the union had declined.
Stern, Deputy Commissioner Adam Silver, owners Peter Holt of San Antonio and Glen Taylor of Minnesota, and senior vice president and deputy general counsel Dan Rube met with Hunter, Fisher and vice president Maurice Evans of the Wizards, and attorneys Jeffrey Kessler and Ron Klempner.
Stern wouldn't comment on Sunday's talks beyond saying they would meet again on Monday, adding they had an agreement with the players not to provide any details.