After the Brooklyn Nets' Brook Lopez and Thaddeus Young opted out of contracts to become unrestricted free agents, the Nets remain strong frontrunners to re-sign the frontcourt players, league sources told Yahoo Sports. General manager Billy King is determined to keep Lopez and Young, and both players opted out of contracts with strong intentions of reaching agreement on new deals with Brooklyn, league sources said. The Nets traded center Mason Plumlee to Portland on Thursday night, further solidifying the franchise's confidence that Lopez will return on a new deal.