DALLAS -- It will take more than a quarter-season of historic production for Mark Cuban to admit that Oklahoma City Thunder point guard Russell Westbrook has proved him wrong.

Cuban, the outspoken Dallas Mavericks owner who declared during last season's playoffs that Westbrook wasn't a superstar, said he still isn't convinced even though Westbrook is on pace to be the first player to average a triple-double since Oscar Robertson in 1962-63.

"He's putting up superstar numbers. That's for damn sure," Cuban said of Westbrook as the Thunder took on the Houston Rockets on Friday night. "I'm not taking anything away from what he's been able to accomplish, but I'm not going to change my definition. He's putting up superstar numbers. You can't deny that."

Westbrook had 27 points, 10 rebounds and 10 assists in Friday's 102-99 loss. It was his seventh consecutive triple-double, the longest streak since Michael Jordan had seven straight in 1989, and his season averages now sit at 30.9 points, 10.8 rebounds and 11.3 assists per game.

Mark Cuban said he'll stick by his definition of superstar but that Russell Westbrook could prove his assessment wrong by the end of the season. Jerome Miron/USA TODAY Sports

Cuban said in April, about an hour before Westbrook's 36-point, 12-rebound, nine-assist performance in Game 5 of the first round to eliminate the Mavs, that a true superstar can carry a mediocre roster to 50 wins and a postseason series win. He noted that the Thunder failed to make the playoffs in 2014-15, when Kevin Durant missed most of the season because of a foot injury.

Led by Westbrook, who has been first- or second-team All-NBA five times and is widely considered an MVP front-runner, the Thunder are 14-9 after Friday's loss and on a 50-win pace for the season. Oklahoma City will have to keep up that pace and perhaps pull off what would be considered a first-round upset for Cuban to recognize Westbrook as a superstar.

"That's no disrespect to Russell," Cuban said. "He's been a beast. Few have done what he's done, but I'll stick by my definition. I'm not saying that he's not going to prove me wrong and that he [won't be] a superstar by the end of the year. That's fine, but I'll stick by my definition."

Information from The Associated Press was used in this report.