The Oklahoman (Darnell Mayberry) reports: Serge Ibaka, the No. 24 overall pick in this year’s draft, has signed a three-year contract with a professional team in Spain. Ibaka’s contract with Ricoh Manresa has NBA buyout clauses at the end of each season that could allow him to join Oklahoma City’s franchise before the deal expires. Financial terms of the contract and buyout clauses are unknown, but under NBA rules teams can pay up to $500,000 to buy out a player from a foreign team.