LONDON — Usain Bolt and Ryan Bailey got the baton at almost exactly the same time Saturday night, then sped down the stretch for the final leg of the 4x100-meter relay.
When Bolt reached his top gear, it was over.
The World's Fastest Man powered Jamaica to a world-record time of 36.84 seconds, making him 3 for 3 for the second straight Olympics. He also won the 100 meters and 200 in London and Beijing.
Bolt picked up another victory long after the record-breaking relay was over. After grudgingly handing the baton to an official right after he crossed the finish line, he got it back about 40 minutes later. He responded with a bow of thanks and kissed his new memento.
Bailey and the United States got the silver in 37.04, matching the old record that Bolt helped set at last year's world championships. Trinidad and Tobago took the bronze in 38.12 after Canada, which was third across the line, was disqualified for running outside its lane.
Before Bolt and Co. took over the track, Mo Farah sent a charge through the capacity crowd at Olympic Stadium when he won the 5,000 meters to complete an Olympic long-distance double for Britain.
Farah surged ahead late and held on to win in 13:41.66. He still had the energy to do a few playful sit-ups on the track before he grabbed a British flag for the real celebration.
Allyson Felix won her third gold medal as the Americans rolled to an easy victory in the women's 4x400 relay, and Russia capped a big day with wins by Mariya Savinova in the women's 800 meters and Anna Chicherova in the women's high jump.
Caster Semenya of South Africa was right behind Savinova to earn a silver medal in her first Olympic final three years after being forced to undergo gender tests.
Team USA clinched the top spot in the medals table for the fifth consecutive Summer Games, helped by David Boudia's victory in the men's 10-meter platform for the country's first gold in diving since 2000.
Boudia scored 568.65 points in the six-dive final, edging Qiu Bo of China by 1.8 points.
ELSEWHERE IN LONDON: Keshorn Walcott of Trinidad and Tobago won the men's javelin. ... Norway retained its Olympic title in women's team handball by beating Montenegro 26-23. ... Germany defeated the Netherlands 2-1 to win its second straight men's field hockey title and spoil a bid for a Dutch double in the sport. ... Russia collected two gold medals in race-walk events, with Elena Lashmanova winning the women's 20-kilometer and Sergei Kirdyapkin taking the men's 50k. ... David Svoboda of the Czech Republic won the men's modern pentathlon. ... Taekwondo golds went to Italy's Carlo Molfetta (men's plus 80-kilogram) and Serbia's Milica Mandic (women's plus 67-kg). It was Serbia's first gold of the games.