Be good, Serena!

Keep it clean for Billie Jean at MSG

Tennis legend Billie Jean King founded the Women’s Sports Foundation in 1974, and it will be the designated charity when the Garden does tennis again on March 1 with the BNP Paribas Showdown.

It is likely the Garden will be the stage for a Serena Williams-Kim Clijsters showdown — possibly their first meeting since the controversial U.S. Open semifinal. On that unfortunate Flushing evening, lashed out at a lineswoman, brandishing her racket and waving the ball after being called for a foot fault to set up match point, yelling: “I swear to God, I’m bleeping going to take this bleeping ball and shove it down your bleeping throat. You hear that?”

King is expecting that Serena will act more in line with what her foundation represents — the very best in female sportsmanship.

“I had never seen her do that, it was an anomaly and I’ve known her since she was 10,” King told The Post’s Marc Berman. “I couldn’t believe that was Serena. She shocked herself and feels so bad. She was horrified later.”

Along with the monetary fines after an exhaustive ITF investigation, Serena is on a two-year probation, meaning one more incident of consequence will lead to her ban from the U.S. Open. King is picking Serena to win the Australian Open, which begins this week to start the new tennis season.

“Serena won it last year and players are very well rested,” King said. “When she’s playing her best, she’s the best player in the world. But Kim is a threat. Serena overpowers everyone, but she can’t overpower Kim.”

Clijsters, the Williams sisters and Svetlana Kutzenova will play the final-four event at the Garden for the King Cup, which is being branded as the American tennis season’s kickoff.

“We want to have tennis in New York City, not just the Open,” said King, a longtime Upper West Side resident.

Sick kids move Revis

Darrelle Revis took time out from his playoff preparations this week to support some of the New York area’s most seriously ill and injured children. Revis recorded a radio commercial this week for St. Mary’s Healthcare System for Children.

St. Mary’s is the New York area’s leading provider of post-acute care for children, treating more than 4,000 children each day in the hospital or at home. In the spot, Revis says, “My toughest friends aren’t football players, they’re St. Mary’s Kids. Imagine a child’s first step after an injury, or a premature baby reaching a first milestone. It’s enough to bring this football player to his knees.”

99’s last sack

While briefing Mark Gastineau on media proceedings at the Steiner Sports announcement on old Giants Stadium collectibles, longtime PR maven John Cirillo informed the former Jet that the press conference would conclude with a final walk on the field.

“If I’m going on the field one last time, I want one final sack. I am going to sack you,” Gastineau told the momentarily-startled flack before roaring in laughter.

“I remember we played the Giants and I tried to plant Phil Simms in the turf,” Gastineau recalled. “After he got up, he got in my face and cursed at me and I said, ‘Man, this guy has really got guts.’ ”

‘Young’ award for Kernan

The New York Professional Baseball Hot Stove League will present our own Kevin Kernan with the prestigious “Dick Young Award” Friday at its 47th annual dinner at Leonard’s of Great Neck.

The scouts association also will honor Mike Garlatti from Rockies as scout of the year. Reigning AL Rookie of the Year Andrew Bailey of the A’s, who starred at Wagner College, will be presented the Star of the Future Award.

Other honorees include author Lee Lowenfish; Bill Decker, coach at Trinity College, the 2008 Div. III national champion; Bill Batewell, longtime coach at Sachem High; scouts John Ceprini of the Rays and the Phillies Chuck Schnabel. Ed Randall will be master of ceremonies and Brooklyn Dodger Ralph Branca the guest of honor. “Scouts are the heart and soul of baseball, and to see how much they care about the game and the players they’ve scouted has been one of the great joys of my job. This is a tremendous honor,” Kernan said.’

Sightings

Herschel Walker (below) at Gallagher’s Steak House talking up his Mixed Martial Arts debut set for Jan. 30 in Miami. . . . Nick Johnson with his wife and friends at Stack Restaurant at the Mirage in Las Vegas, dining on sea bass and filet mignon and toasting his return to the Yankees with two bottles of Veuve Cliquot bubbly. . . . Osi Umenyiora surprising Giants teammates Kevin Dockery and Terrell Thomas with an Absolut vodka ice luge with their jerseys frozen inside along with a helmet-shaped cake to celebrate their birthdays at Hudson Terrace on Monday.

Rangers night at Foxwoods

MGM Grand at Foxwoods will play host to a Rangers-themed viewing party Thursday for their game in Philadelphia against the Flyers. Fans will be able to watch the action on multiple big screens, interact with Rangers favorites Adam Graves, Ron Duguay and Nick Fotiu, and win autographed memorabilia and other Rangers merchandise.

A limited amount of packages are still available for $125 per person, which includes hotel room, admission to the viewing party, meet and greet, dinner and $20 in match play at the casino. Visit nyrangers.com for more information.

S-E-C you next year

The Southeastern Conference has won the last four BCS national championships, and though we’re nine months away from the next college football season, there already are those who see that trend continuing.

“Right now, it’s going to be hard not to see Alabama and Florida as No. 1 and No. 2 to start the season,” South Carolina coach Steve Spurrier told The Post’s Tim Sullivan this week. “Yep, it’s going to be tough for the rest of us here in the SEC.”

If this keeps up, who knows, there might be a year where two teams from the same league — and it most likely will be the SEC, if it ever happens — face each other in the title game. If that time ever comes, there’s a good chance it will be the Gators and the Crimson Tide, who have combined for three of those four aforementioned BCS crowns.

“They’re both very, very good,” Spurrier said. “And that’s not going to change.” Perhaps they should change what “BCS” stands for: From the “Bowl Championship Series” to the “Bowl Championship according to Spurrier.”