"It was so nasty and there's never a winner in any fight." Usher insists he doesn't feel like the victor after gaining full custody of his kids following a bitter court battle with his ex-wife Tameka Foster. The R&B star has opened up about his failed marriage and custody battle in a tell-all interview with Oprah Winfrey, which will air in the U.S. on Oprah's Next Chapter on Sunday (16Sep12).