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Tokyo Olympic Games on BBC Dates: 23 Jul-8 Aug Time in Tokyo: BST+8. Listen live on BBC TV, BBC iPlayer and BBC Red Button; Listen live on BBC Radio 5 Live, Sports Extra, and Sounds; Live text and video clips available on BBC Sport app and website.
Elaine Thompson-Herah was the second fastest woman in history, beating Shelly-Ann Fraser -Pryce. This result allowed her to defend her Olympic 100m title.
The 29-year old ran 10.61 seconds. This is a new Olympic record. It also falls 0.12 seconds short of the 1988 world record by Florence Griffith-Joyner.
Shericka Jackson finished the Jamaican one-two-3 in Tokyo at 10.76, 0.02 slower than Fraser-Pryce.
Daryll Neita, Great Britain, finished eighth in 11.12.
Dina Asher Smith, Dina's teammate, failed to make it to the final. She then pulled out of the 200m after she revealed that she had tore her hamstring.
Thompson-Herah said that she had been struggling with her injury for a while after the victory.
"I see all the negative comments. "I take all my losses and all my defeats as motivation.
Thompson-Herah wins the Jamaican shakedown
Elaine Thompson-Herah ran several metres before the line
Fraser-Pryce qualified fastest for the final and was put under pressure as her usual whipsmart start didn't fire as she expected.
Fraser-Pryce was supported by the tall, muscular Thompson-Herah over her shoulder as she ran the last 30 metres.
Thompson-Herah was able to take a moment to thank the photographers and the clock as she crossed the finish line in a time that was comparable with Griffith-Joyner’s second-fastest.
It also set a new Olympic record.
Thompson-Herah, third in the Jamaican trials this year, savored her win over domestic rivals with little consolation for a grim Fraser-Pryce.
The 34-year old was trying to become the first woman to win three Olympic 100m titles.
"It is a great honour to have the opportunity to once again stand on the podium as a mother and for my fourth Olympics.
"But, you have to understand that my emotions are still very raw at the moment. "I am certain I will return home, and there will be tears."
Just in time, Achilles injury is less severe
Thompson-Herah has suffered from an Achilles tendon injury almost five years.
She was forced to pull out of Doha 2019, where she had hoped for her first individual world title. She instead watched as Fraser-Pryce won her fifth world crown.
Due to recurring pain from the injury, she was close to withdrawing from last month's Jamaican trials.
She managed to get to the start line, qualifying in the 100m & 200m. This will give her a chance to do the sprint double from Rio.
Fraser-Pryce will have a chance to retaliate with Tuesday's 200m final.
Hodgkinson leads British trio into 800m final
Great Britain will be hosting three women's 800m athletes for the first-ever time. Keely Hoopkinson is the star performer.
The 19-year old won her semi-final in one minute, 59.12 seconds.
Jemma Reekie finished second in her semi-final at 1:59.77. Alex Bell (1:58.83), qualified for Tuesday's final, as one of two fastest losers.
It's a dream coming true. Bell said, "I didn't expect to be on that journey." Bell said, "I never dreamed I'd be an Olympic finalist."
GB will field three men in the 100m semi-finals on Sunday. Zharnel Hughes runs a season's fastest of 10.04 seconds. CJ Ujah (10.08 seconds) qualifies automatically.
Reece Prescod's season's best (10.12) saw him qualify as one of three fastest losers. Andre de Grasse, Canadian bronze medallist 2016, was the fastest qualifier from Saturday’s heats.