Justin Timberlake is on the ropes over a girl he used to see, but hasn't gotten over. Justin Timberlake released his new single "TKO."

Justin Timberlake has been teasing about the new single, "TKO," with videos and photos. Justin Timberlake finally let "TKO" slip. "TKO" runs seven minutes and shows Justin Timberlake singing about a girl from his past after he sees her with another man.

Justin Timberlake's new single is the follows up to his lead single, "Take Back the Night," off his upcoming album, "The 20/20 Experience - 2 of 2."  

Justin Timberlake's album, "The 20/20 Experience - 2 of 2,"  was produced by Timbaland. The new Justin Timberlake album features guest vocals from Drake and Jay-Z. The second part of Justin Timberlake's "The 20/20 Experience" is scheduled to arrive on September 30.

Justin Timberlake said he wrote too many songs for his new album, but instead of scrapping them, he will put them out as two separate albums.

Justin Timberlake told Ryan Seacrest "I just felt like so much of it went together. I wanted to release a double album, but then after speaking to my label, we thought it would an interesting idea to see what it would be like to split up a double album and release it over the course of a year. "The songs that I released in March just reminded me of summertime a little bit more and the songs that are coming out this month felt a little darker so they made me feel like the fall/winter collection," he added.