The women's quartet, of Zoey Clark, Laviai Nielsen, Perri Shakes-Drayton and Emily Diamond, crossed in a time of 3:24.74 - one second faster than the time that won Team GB bronze in the event last summer. Last week when the sprinter ran his last individual race, he didn't have a happy ending and was edged by Justin Gatlin and Christian Coleman of the U.S. despite Bolt running his season best of 9.96 seconds.
Daniel Talbot, the oldest member of the gold-medal winning relay team at 26, believes the victory could provide a foundation for Great Britain to continue challenging the United States and Jamaica for the top honours.
But Mitchell-Blake refused to buckle in the final stages, holding his form to hit the line as the home crowd went wild with celebration.
Perhaps the best chance for a Russian athlete competing as a neutral to win an event: since winning the world title in Beijing two years ago, Maria Lasitskene has won 33 of her 36 competitions indoors and outdoors and arrives in London on a run of 24 competition wins.
Bolt is retiring in August following the London World Championships. "We hope for the best for him", he added.
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J-Matt was the best teammate and friend you could ask for. "We know we were going to have tough decisions to make". The Buffalo Bills aren't building for a long-shot run at snapping the franchise's lengthy playoff drought in 2017.
Bolt beaten into third in the individual 100m behind Gatlin and his United States team compatriot Christian Coleman, was comforted by teammates after getting to his feet, his face etched in pain.
"I wasn't sure if I had won or not, I gave it my all but I could see Christian Coleman out of the corner of my eye", said Mitchell-Blake.
Rico Freimuth closed in on decathlon leader Kevin Mayer by producing the longest throw in the discus at the world championships.
McLeod added: "It just happened - Usain Bolt's name will always live on".
Bolt ended his career on the track with 11 World Championships gold medals.
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After Spieth missed his third birdie putt in the 12- to 16-foot range, Phelps muttered, "Where were those misses when we played?" He followed with two 3-woods that led to easy birdies, and Stricker shot a 1-under 70 that will allow him to make the cut.
Hosts Great Britain took the gold medal with a time of 37.47 seconds. "He's the greatest of all time".
Britain were second in the first heat in 37.76, also faster than Jamaica's time, while Japan were third.
But while that result left a spent Farah flat on the track with his head in his hands, the emotion amongst Britain's young female sprinters as they danced with delight on their lap of honour could not have been more different.
The changeover to Talbot was excellent and the bend specialist didn't disappoint as America and Jamaica realised they were already playing catch-up.
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The market was waiting f or USA consumer inflation data on Friday that would offer more clues about future Fed decisions. The Dow Jones industrial average closed 0.9% lower on Thursday, while the S&P 500 dropped 1.5% and the Nasdaq shed 2.1%.
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