U.S. OPEN NOTEBOOK

The forever flaky Vince Spadea has ticked off players on the men’s circuit, including James Blake, for his new book – Breaking Point, The Secret Diary of A Pro Tennis Player.

Spadea will frequently put his name down on the practice sheet and the other slot will go unsigned.

“We’re having a hard time finding practice partners and doubles partners,” Spadea’s coach John Skelly told The Post. “So one time we wrote in Paris Hilton.”

Co-authored by Dan Markowitz, Spadea depicts Blake as not the nice guy everyone thinks, and he tears apart Blake’s game. Blake said Spadea “crossed the line.”

Spadea told The Post yesterday, “That’s a political statement that holds no value. I don’t know what that code is. Is it written down?”

A self-described single surfer dude from California, Spadea also writes about his womanizing on the tour. “There’s some romantic endeavors – women count for 50 percent of the population, so I’ve run into some things on the tour besides tennis balls,” Spadea said.

In his book, Spadea penned, “You hit it deep to Blake’s backhand, he’s not going hurt you, his serve also lets him down. There are always one or two service games a match he just folds or double-faults . . . Blake’s forehand is not correct with his geometry. If you ask an expert, there’s no way in the world he’s going to tell you that Blake’s forehand is rock solid.”

Spadea and Blake had a falling out in Vienna in 2002 when Blake accused him of stalling when he took a bathroom break.

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The men’s third seed is out, but relax, it’s only Croatian Ivan Ljubicic, who lost in straight sets 6-3, 6-3, 6-3 to Feliciano Lopez. Ljubicic, a French Open semifinalist, is best known for ripping Andy Roddick a few years ago at the Open for showboating.

Lindsay Davenport shook off a bad shoulder and won her first-round match over Klara Zakopalova 6-1, 6-4.

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Today’s featured matches

Women’s singles

ARTHUR ASHE STADIUM

Day Session (begins at 11 a.m.)

Amelie Mauresmo (1), France, vs. Kristina Barrois, Germany

Night session (begins at 7 p.m.)

Maria Sharapova (2), Russia, vs. Michaella Krajicek, Netherlands Lourdes Dominguez Lino, Spain, vs. Serena Williams, United States

LOUIS ARMSTRONG STADIUM (play begins at 11 a.m.)

Peng Shuai, China, vs. Martina Hingis (8), Russia

Men’s singles

ARTHUR ASHE STADIUM

Day Session (begins at 11 a.m.)

Mark Philippoussis, Australia, vs. Rafael Nadal (2), Spain

Night Session (begins at 7 p.m.)

Juan Monaco, Argentina, vs. James Blake (6), United States

LOUIS ARMSTRONG STADIUM (play begins at 11 a.m.)

Lleyton Hewitt (15), Australia, vs. Albert Montanes, Spain

GRANDSTAND (play begins at 11 a.m.)

David Nalbandian (4), Argentina, vs. Michael Berrer, Germany

TV: USA, 11 a.m. & 7 p.m.