Los Angeles Clippers — Trading For Mo Williams
As the Cleveland Cavaliers began dismantling the first iteration of the team they built around LeBron James (when the latter left Cleveland for Miami), the Cavaliers traded away Mo Williams to the Los Angeles Clippers. In exchange, the Clippers sent away Baron Davis and a future first round pick.
That first round pick, now possessed by the Cavaliers, ended up being the #1 pick in the 2011 NBA Draft, which the Cavaliers used to select guard Kyrie Irving. Irving became one of the most gifted scorers in the NBA, and in 2016, hit one of the most memorable shots in NBA Finals history, helping the Cavaliers win their first NBA Championship.