Brock Lesnar Confirms WWE Retirement in Trending Video After SummerSlam Loss to Oba Femi Bleacher ReportBrock Lesnar retires from WWE following SummerSlam match with Oba Femi Yahoo SportsBrock Lesnar retires: Former WWE, UFC champion says 'that's it' after SummerSlam CBS SportsPhotos: Femi and Lesnar try to destroy each other inside Hell in a Cell WWEBrock Lesnar retires from wrestling, ends WWE career USA Today