Vasilis Charalampopoulos is declaring for the 2018 NBA Draft.

"It has always been a dream to play in the NBA," Charalampopoulos told ESPN. "Entering the draft gives me the opportunity to challenge myself outside of Europe. This decision to enter the draft was not difficult. The difficult part was finding when the right time was for me." 

Charalampopoulos is a 21-year-old 6-foot-9 power forward.

O.J. Mayo has agreed to sign with San German in Puerto Rico.

Mayo will report to the team this month and will be eligible to sign an NBA deal this summer.

Mayo received a two-year suspension from the NBA in 2016 for violating their anti-drug program.

LiAngelo Ball has declared for the 2018 NBA Draft.

Ball has played professionally with Lithuanian team Vytautas Prienu since parting with UCLA in December.

Ball is expected to work out for several NBA teams when he returns from playing for Vytautas and will participate in the Pro Basketball Combine at IMG Academy (Florida) in May in front of team executives.

Georgios Kalaitzakis told ESPN that he will declare for the 2018 NBA Draft.

"I am very happy with Panathinaikos, but I decided to enter the draft because it's my dream to play in the NBA," Kalaitzakis wrote ESPN. "With hard work and commitment, I think I will achieve my goal."

Kalaitzakis is viewed as a potential second round pick as a 6'6 combo guard.

Kalaitzakis is currently playing for Panathinaikos.

The Australian National Basketball League has formalized a rule that should make it much easier for future prospects to forgo college and develop in Australia instead.

Terrance Ferguson, the No. 11 high school recruit in 2016, signed with the Adelaide 36ers instead of being a one-and-done in college and was drafted by the Thunder in 2017 with the No. 21 overall pick.

Sources told ESPN those players will be paid 100,000 Australian dollars gross guaranteed (approximately $78,000 U.S.), funded directly by the league.

"Unlike other countries where players and agents deal with clubs, the NBL will directly contract the players," NBL owner and executive chairman Larry Kestelman said in a release provided exclusively to ESPN. "We will make sure the players get the development they need as part of the program with our clubs, giving them the best chance of success.

"The NBL provides strong visibility back to the U.S. Our league is closest to the NBA in terms of style of play and game day presentation. We will work to build a program to provide the right access to NBA teams and scouts alike."

Boris Diaw has received interest from several playoff teams about a contract.

Diaw has an NBA out in his deal with Paris-Levallois.

Diaw played for the Utah Jazz last season.

Billy Preston has signed with BC Igokea, a European club located in Bosnia and Herzegovina.

Preston had not appeared in a regular season game this season for Kansas as the school investigates the "financial picture" of a car Preston was driving in a single-car accident from early November.

Preston was a top-20 recruit in the incoming 2017 class.

The Houston Rockets plan to sign Bobby Brown to a contract for the remainder of the season at a later date.

Brown is also in talks with teams in China.

The Rockets released Brown in order to keep a roster spot open following the strong play of Gerald Green.

Derrick Williams has signed a contract with the Tianjin Gold Lions of the Chinese Basketball Association.

Williams played for five teams in his eight NBA seasons, averaging 8.9 points and four rebounds per game over his career. 

Williams played for the Cavaliers and Heat last season.

LiAngelo Ball and LaMelo Ball have agreed upon one-year deals with Prienu Vytautas of Lithuania. Both players will report to the team in January.

LiAngelo Ball recently withdrew from UCLA following his indefinite suspension.

Over the past week, Harrison Gaines, the representative for LaMelo and LiAngelo, fielded multiple offers and worked to finalize the finer details of a unique contract situation. 

“We engaged in serious talks with several teams, and Vytautas made the most sense as LaMelo and LiAngelo work to develop as professionals and set a foundation for their careers,” Gaines said. “It was critical to find a situation in a competitive league that works with both of their short- and long-term goals.”