In Olympics, a first for Puerto Rico _ and 23rd for Phelps

Germany's Angelique Kerber reacts after winning a set against Monica Puig of Puerto Rico in the gold medal match of the women's tennis competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Saturday, Aug. 13, 2016. (AP Photo/Vadim Ghirda)
Jamaica's Usain Bolt celebrates after winning a men's 100-meter heat during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Saturday, Aug. 13, 2016. (AP Photo/Martin Meissner)
Spain's Rafael Nadal reacts after winning a point against Juan Martin del Potro of Argentina in the semifinals of the men's singles tennis competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Saturday, Aug. 13, 2016. (AP Photo/Vadim Ghirda)
Great Britain's Andy Murray reacts after winning a point against Japan's Kei Nishikori in the semifinals of the men's singles tennis competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Saturday, Aug. 13, 2016. (AP Photo/Vadim Ghirda)
United States' Michael Phelps shakes hands with teammate United States Nathan Adrian after their team won the men's 4 x 100-meter medley relay final during the swimming competitions at the 2016 Summer Olympics, Saturday, Aug. 13, 2016, in Rio de Janeiro, Brazil. (AP Photo/Michael Sohn)
Michael Phelps is hugged by teammates after they won a gold medal in the 4 x 100 meter medley relay during the swimming competitions at the 2016 Summer Olympics, Saturday, Aug. 13, 2016, in Rio de Janeiro, Brazil. (AP Photo/Morry Gash)
Justin Rose of Great Britain, tees off on the 16th hole during the third round of the men's golf event at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Saturday, Aug. 13, 2016. (AP Photo/Alastair Grant)
United States' Michael Phelps and Britain's James Guy compete in the men's 4 x 100-meter medley relay final during the swimming competitions at the 2016 Summer Olympics, Saturday, Aug. 13, 2016, in Rio de Janeiro, Brazil. (AP Photo/Rebecca Blackwell)
Britain's Mo Farah celebrates winning the gold in the men's 10,000-meter during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Saturday, Aug. 13, 2016. (AP Photo/David Goldman)
Jamaica's Elaine Thompson wins the women's 100-meter final during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Saturday, Aug. 13, 2016. (AP Photo/David Goldman)
Monica Puig, of Puerto Rico, serves to Angelique Kerber, of Germany during their final round match at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Saturday, Aug. 13, 2016. (AP Photo/Charles Krupa)
United States' Jeff Henderson celebrates winning the gold medal in the men's long jump during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Saturday, Aug. 13, 2016. (AP Photo/Natacha Pisarenko)
United States' Michael Phelps celebrates with teammates after winning gold in the men's 4 x 100-meter medley relay final during the swimming competitions at the 2016 Summer Olympics, Saturday, Aug. 13, 2016, in Rio de Janeiro, Brazil. (AP Photo/Rebecca Blackwell)
United States' Michael Phelps and teammates Ryan Murphy, right, and Cody Miller cheer for United States Nathan Adrian as he takes the final lap in the men's 4 x 100-meter medley relay final during the swimming competitions at the 2016 Summer Olympics, Saturday, Aug. 13, 2016, in Rio de Janeiro, Brazil. (AP Photo/Lee Jin-man)

RIO DE JANEIRO — Michael Phelps claimed his 23rd gold medal. Puerto Rico won its first ever. And Jamaica got its first gold of the Rio Games with an emphatic win in the marquee Olympic sprinting event.

Phelps helped lift the 4x100 medley relay team to victory Saturday in what marked his last race before retiring, capping a night of extraordinary accomplishments in the 2016 Olympics.

Elaine Thompson of Jamaica won the women's 100-meter title in 10.71 seconds, ending fellow Jamaican Shelly-Ann Fraser-Pryce's bid to win the event for a third straight Olympics. She won the race in dominating, Usain Bolt-like fashion — and it may be a sign of things to come for Jamaica in the coming days.

Bolt thrilled the crowd at Olympic Stadium on Saturday in his first appearance of the games, and he will go for gold in the 100 meters Sunday.

Monica Puig won Puerto Rico's first gold medal in any sport in Olympic history, upsetting Angelique Kerber in the women's tennis singles final. Puig is ranked 34th and is the first unseeded women's singles gold medalist since tennis returned to the Olympics in 1988.

Seeded second, Kerber won the Australian Open in January and was the runner-up at Wimbledon last month.

On the men's side, Rafael Nadal was toppled by Juan Martin del Potro of Argentina, ending his bid for a second Olympic singles gold medal.

While competitions wrapped up in swimming and rowing, they're just heating up in track and field, where Mo Farah of Britain recovered from a fall to defend his Olympic 10,000-meter title and American Jeff Henderson overtook Luvo Manyonga of South Africa on his last jump to win the long jump gold medal.

Phelps' victory came just minutes after the women's medley relay gave the United States its 1,000th Olympic gold medal in the history of the Summer Games.

If this was indeed the end, then Phelps went out in style, with 28 medals overall, having won five golds and a silver in Rio de Janeiro. He also said the London Games were his last four years ago only to change his mind.

He insists he won't be coming out of retirement again for Tokyo in 2020.

"I'm not going four more years and I'm standing by that," he said. "I've been able to do everything I've ever put my mind to in the sport and after 24 years in the sport, I'm happy with how things finished."

Other highlights from Day 8:

GOLF GOLD : For all the talk about top players skipping Rio, the sport couldn't have asked for a better final round. Justin Rose of Britain is the third-round leader and will be trying to win golf's first gold medal in 112 years. Rose made two eagles in the opening five holes and shot a 6-under 65 to build a one-shot lead over British Open champion Henrik Stenson.

SLUGGISH SPRINTER : Bolt did not disappoint the crowd, but he was displeased with himself. He was slow out of the blocks but once his tall majestic frame reached full flow, there was no stopping him. "It wasn't the best start, it felt kind of sluggish," Bolt said, adding that he never has been a morning person and preparations for his noon race felt unusual.

LONELY RUSSIAN : The IAAF has banned the only Russian in Olympic track and field from competition and she is appealing the ruling. A decision on Darya Klishina's petition is expected before the long jump competition begins Tuesday. The former European indoor champion was the only one of 68 Russians allowed to compete in track amid a doping scandal.

GOODBYE GREEN : After blaming algae, heat and even the number of swimmers for the green water at Maria Lenk Aquatics Center, officials now say a contractor mistakenly dumped hydrogen peroxide into the pool, causing an adverse reaction with chlorine. So, they're draining the larger pool to transfer nearly 1 million gallons from a nearby practice pool.

PHOTO FINISH : After rowing for more than a mile, the gold medal came down to an inch. New Zealand's Mahe Drysdale and Croatia's Damir Martin crossed the finish line in the men's single sculls side by side, not knowing which one of them was the new Olympic champion. A photo analysis showed Drysdale won by a thumb's length.

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AP Summer Games website: http://summergames.ap.org

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Follow AP Sports Writer Arnie Melendrez Stapleton on Twitter: http://twitter.com/arniestapleton

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