By MIKE BALDWIN, The Oklahoman

The worst pro sports franchise?

The Los Angeles Clippers.

It's not even close.

Based on win-loss percentages the past 30 years, the Clippers are the worst of the worst among NFL, MLB and NBA franchises.

Changing one component sometimes can alter the entire picture.

That's what the Portland Trail Blazers, Los Angeles Lakers, Houston Rockets and Orlando Magic believe. All four made at least one significant offseason change to their roster.

Portland added Andre Miller, an underrated point guard in Philadelphia.

Jordan Hill has overcome obstacles more difficult than any adjustment he will face as an NBA rookie.
Lottery pick? There was a time he wasn't even on college coaches' radars.
Hill lived in four different residences with six different caregivers. He was 3 years old when his mother died of breast cancer.

A lot of pro athletes complain to officials. They're competitors. They want a fair shake. That's understandable.
Any guess how many technical fouls were assessed this past season in the NBA? A lot.
Complaining isn't exclusive to the NBA.
NFL players constantly ask referees to watch for holding, a receiver pushing off or a defender's cheap shot tactics.

For one moment, set aside the never-ending debate about whether LeBron James will someday be worthy of being compared to Michael Jordan.
James accepting his first MVP award at his high school was a feel-good story in a cynical sports world.
First, let's set the scene.

NBA teams fired eight coaches this season. Six before Christmas.
How many interim guys will be back next season?
Lionel Hollins was given the job full-time in Memphis. But even Hollins' job security is tenuous since he was given only a one-year deal through the 2009-10 season.

The chase for home-court advantage in the upcoming NBA playoffs could come down to the final day of the season.
How important is home-court advantage?
Extremely important.
If you're not seeded No. 1 or No. 2, history suggests you won't reach the NBA Finals, much less win the title.

Tyson Chandler isn't returning to Oklahoma City after all.
Thunder general manager Sam Presti announced Wednesday night the team has rescinded its trade with the New Orleans Hornets for Chandler after Oklahoma City medical officials weren't satisfied with results of a physical exam.