After declaring for the NBA draft March 31, Washington junior Isaiah Thomas left the door open that he might return to school when he didn't hire an agent.

That door slammed shut today when the Husky guard told coach Lorenzo Romar he plans to remain in the draft. The deadline to withdraw from the draft and return to school is today.

"When I spoke with Isaiah, in his mind he felt this is what he was ready to do," Romar said minutes ago. "He just felt he would show why he'd be worthy of being drafted higher. He has a high level of confidence in what he can get done."

Washington State guard Klay Thompson will remain in the NBA Draft and will not return to school for his senior season, the school announced Sunday night.

Thompson led the team and the Pacific-10 Conference -- and ranked 11th in the country -- with 21.6 points per game while setting a school record with 733 points during the 2010-11 season. He was named first team all-Pac-10 for the second consecutive season.

“After taking the last few weeks to make my decision about the NBA, I have decided to remain in the draft,” Thompson said in a statement. “I am thankful for my three years at Washington State and have enjoyed my time in Pullman. My dream has always been to play in the NBA and I am excited to take the next step in making that a reality.”

DeAndre Liggins heard all he needed to convince him that the time was right to jump to the NBA.

The University of Kentucky guard will forgo his senior season and remain in the NBA draft, the school announced Sunday night.

“Coach (John Calipari) encouraged me to come back for my senior season, but based on the feedback I got from NBA personnel, I felt it was in the best interests of me and my family to stay in the draft,” Liggins said in a release. “I learned a lot in my three years here at Kentucky, and I appreciate all the support I got from the people at UK as well as the Big Blue Nation.”

The 6-foot-6 Liggins is known for his strong perimeter defense. He received Lefty Driesell Defensive All-America honors and was named the Yahoo! Southeastern Conference Defensive Player of the Year after leading the Wildcats with 46 steals. He also had 28 blocked shots.

After leading Butler University to consecutive Final Fours, junior guard Shelvin Mack has decided to stay in the 2011 NBA Draft, a source with knowledge of the decision told Yahoo! Sports.

Mack started to inform people of his choice on Saturday and is expected to hold a news conference with his college coach, Brad Stevens, on Tuesday in Indianapolis. The deadline for underclassmen to stay in the draft or return to college is Sunday.

Front office executives and scouts project Mack as a late first-round to early second-round pick.

Kawhi Leonard signed with Brian Elfus of Impact Sports Management, a firm that is well entrenched in the NFL and is beginning to grow its client base in basketball.

Its biggest basketball name is Charlotte Bobcats forward Tyrus Thomas, in his fifth NBA season after leaving Louisiana State following his freshman year.

SDSU coach Steve Fisher said he was consulted in the process and approved of the decision.

“I’ve known (Elfus) for a long time,” Fisher said. “Kawhi had three or four finalists that the family interviewed, and I felt none of them would be a bad choice. They did a good job.”

Tobias Harris will remain in the NBA draft, forgoing his final three years of eligibility.

“Ever since I was little, it has been my dream to play in the NBA,’’ said Harris, a 6-foot-8, 225-pound forward. “I’ll always remember how great the fans, coaches and teachers were to me at Tennessee, and I hope they’ll remember me as a player who gave his all each and every day.’’

Harris was second at Tennessee with 15.3 points and 7.3 rebounds per game, and he shot 46 percent from the floor, 30.3 percent from beyond the three-point arc and 75.3 percent from the free-throw line.

He is projected as a first round pick.

Brandon Knight will remain in the NBA draft, he announced Friday morning, becoming the fifth one-and-done player in John Calipari’s two seasons as the Wildcats’ coach.

Knight said he “strongly considered” returning to Kentucky for his sophomore season but ultimately couldn’t pass on the opportunity to be a top-10 pick in the June draft.

Knight said that he “definitely” will finish his degree and will try to get credit hours during the NBA lockout.

Jordan Williams has signed with an agent, a move that rules out any possibility of his returning to the University of Maryland.

According to sources, Williams will be represented by agent Andy Miller of ASM Sports, whose clients include NBA players Kevin Garnett and Chauncey Billups.

Listed at 6 feet 10, Williams averaged 16.9 points and an ACC-best 11.8 rebounds per game for the Terrapins in 2010-11 and set a single-season school record with 25 double-doubles.

Michigan sophomore guard Darius Morris has decided to stay in the draft, according to DraftExpress.com’s Jonathan Givony.

A phone call left for Morris’ father, DeWayne Morris Sr., seeking confirmation, was not returned. Tweets seeking confirmation to both Morris and his brother, DeWayne Morris Jr., were also not returned.

Morris is projected as a late first to early second round pick.