Dallas ? Like most longtime Dallas Mavericks fans, Mark Cuban remembers the bad old days, when “postseason play” meant being part of the draft lottery.

Boy, how times have changed.

Injected with Cuban’s cash, Dirk Nowitzki’s jumper and Avery Johnson’s leadership, the Mavs are headed to the NBA finals for the first time, starting Thursday night at home against the Miami Heat.

“We’re excited, obviously,” Johnson said after the Mavericks erased an 18-point deficit to beat Phoenix, 102-93, Saturday night and earn the silver trophy that goes to the Western Conference champion. “Nobody is ripping their shirts off or going too crazy, but they should celebrate.

“But we know we still have a lot of work ahead of us.”

With the Mavs taking Sunday off and several days after that to delve into how they will try slowing Dwyane Wade and Shaquille O’Neal, it’s worth looking back at how far this franchise has come, both over the long term of its 26 years and the short term of an uncertain start to this season.

The Mavericks were born in 1980, became contenders amazingly quickly, then faded faster than you can say Roy Tarpley. They were so bad in the 1990s that they had the lowest winning percentage of any team in major pro sports in North America – yes, even worse than the Clippers.

“You could walk up two minutes before game time and buy a front-row seat for $10,” said Cuban, a cheap-seat regular long before he became an Internet billionaire.

When he bought the team in January 2000, Dallas was 9-23 and well on its way to collecting lottery pingpong balls for a 10th straight year.

A massive throng waits outside the security fences of Love Field for the Dallas Mavericks to return home after their victory over Phoenix. The Mavs beat the Suns on Saturday night in Phoenix and returned early Sunday morning.

“Just to speculate we would make the playoffs in the next five years was heresy,” Cuban recalled Saturday night in Phoenix, wearing his new Western Conference champion hat and T-shirt. “Now, we’ve gotten to this.”

Beyond making the finals, Dallas has re-established itself as a playoff perennial. The Mavs have made six straight trips to the playoffs, the longest run in team history, and done so with only one constant: Nowitzki.

While the players, coaches and even the home court have changed, the most important shift was the dedication to defense that Johnson brought when he replaced Don Nelson late last season.

“He demanded it,” said Donnie Nelson, the team’s president of basketball operations and Don Nelson’s son. “That’s the difference.”

The way Nowitzki and the Mavs have played lately, this finals breakthrough isn’t surprising. Think back to October and it’s a different story.

Dallas was widely seen as a middle-of-the pack playoff team, with the ever-improving Nowitzki leading the way, a deep rotation of solid players around him and Johnson, in his first full season, having to sort it all out.

The top story line was Doug Christie replacing longtime star Michael Finley. Christie ended up being gone quickly and Adrian Griffin, who was sitting on a sofa waiting for his phone to ring, ended up becoming the designated defender in the starting lineup.

Injuries were a big challenge, too. It was never anything like Phoenix losing Amare Stoudemire, but for a long while it seemed like every time someone came out of the trainer’s room, someone else went in.

“I missed the first 20-some games of the season, then we had other guys that were injured,” forward Jerry Stackhouse said. “And we were still able to just hold everything together. I think that built a lot of character for our team.”

Johnson’s biggest in-season move was making a starter of DeSagana Diop – until then, known only for being a huge bust in Cleveland – and turning Erick Dampier into a high-priced reserve.

All the Mavericks did after that was win 13 straight games and 20 of 21.