After four years at Florida State University to Toney Douglas reported to the NBA Draft 2009. He was selected by the Los Angeles Lakers in the first round to 29th place and on the same day for a compensation amount and a second-round draft pick to the New York Knicks transferred. In the first year he played in 56 games an average of 19.4 minutes, scoring 8.6 points and 2 assists. In the second year he was in 81 games averaged 24.3 minutes on the field, scored 10.6 points with 3 assists. To date, these are his Karrierebestwerte. The next year he received considerably less playing time.
On 11 July 2012, he joined together with Josh Harrellson, Jerome Jordan and two second-round draft picks in exchange for Marcus Camby to the Houston Rockets.
On February 20, 2013, was transferred along with Cole Aldrich, Patrick Patterson and a compensation amount to the Sacramento Kings. The Kings received for Francisco Garcia, Tyler Honeycutt and Thomas Robinson.
On July 18, 2013 Douglas was obliged as a free agent by the Golden State Warriors. He received a one-year contract. The Warriors, however, Douglas was not convincing as hoped and was transferred to January 2014 via trade to the Miami Heat.