Elaine Thompson-Herah won the womens 200m final at the Tokyo Olympics on Tuesday.The Jamaican, who won gold in the womens 100m, clocked a time of 21.53 seconds the second fastest ever in the history of the womens event.Thompson-Herahs stunning victory confirmed a double-double, with the 29-year-old having also won 100m and 200m gold at the 2016 Games in Rio.Namibias Christine Mboma claimed silver, ahead of bronze medalist Gabrielle Thomas of Team USA.Thompson-Herahs compatriot Shelly-Ann Fraser-Pryce, who won silver in the 100m, finished fourth.Honestly I just need to sleep, I have not slept since the 100m, Thompson-Herah told the BBC after pulling clear in the final 50m to secure the win.Honestly my body is in shock mode, but I still had my composure to come out here.I [thought] my time wouldnt be fast, because yesterday we ran two rounds, which took a lot from me I equalled my Personal Best last night. So to come out to get a national record and two-time Olympian, I am so happy.I was begging for the line, but you have to hold your technique through the line. I know my grandma is celebrating right now.It feels good to be in the history book, to set a barrier for the other generation of athletes coming up, because we have got a lot of athletes coming from Jamaica, it means a lot to me to set this barrier.Everyone who supports me and believes in me, a big thank you to them.Christine Mboma won silver for Namibia and USAs Gabrielle Thomas took bronze1) Elaine Thompson-Herah (JAM) - 21.53 seconds2) Christine Mboma (NAM) - 21.813) Gabrielle Thomas (USA) - 21.874) Shelly-Ann Fraser-Pryce (JAM) - 21.945) Marie-Josee Ta Lou (CIV) - 22.276) Beatrice Masilingi (NAM) - 22.287) Mujinga Kambundji (SWI) - 22.308) Shaunae Miller-Uibo (BAH) - 24.00