- Mo Farah wins back-to-back 5000m gold
- Brit had already won 10,000m at Rio 2016
- US men and women win 4x400m relays
- Caster Semenya takes 800m title
(CNN)The talk of the town at Rio 2016 may have been Usain Bolt's quest for the "triple-triple" but Britain's Mo Farah made his own piece of history by sealing the "double-double" on Saturday.