Day 8 at the 2016 Rio Olympics brought a number of exciting moments, but the headliner clearly stole the show.

Michael Phelps went out just as we all thought he would -- as a winner. He was part of the men's 4x100-meter medley relay team that won gold, capping off the career of the greatest Olympian in history.

That was just one tidbit of a busy Saturday in Brazil. Here are some takeaways from the day's events.

A storybook ending

Michael Phelps went out on top, winning a gold medal in his final Olympic race. He swam the butterfly in the 4x100-meter medley relay, and watched Nathan Adrian finish the race in Olympic-record time. Phelps finishes his storied Olympic career with 28 medals and 23 golds, both records. Despite the protests of his teammates, Phelps reiterated after the race that this is his final Olympics, and that he is looking forward to what comes next.

Rule the pool

The U.S. swimming team absolutely dominated the pool in Rio de Janeiro. The Americans took home 33 total swimming medals -- 16 gold, eight silver and nine bronze -- in what was expected to be a weak year. That medal total would currently be third as an independent nation.

A breakout star

Simone Manuel made history by becoming the first African-American woman to win an individual swimming medal, but she didn't stop there. Manuel won silver in the 50-meter freestyle and followed that up by swimming the freestyle in the gold medal-winning women's 4x100-meter medley relay. Overall, the 20-year-old won four medals in Rio.

World's fastest woman

It wasn't Shelly-Ann Fraser-Pryce, but a Jamaican is still the fastest woman in the world. Elaine Thompson cruised to a gold medal in the 100 meters, with American Tori Bowie taking silver and Fraser-Pryce, who had won the last two Olympic 100-meter golds, staying on the podium with bronze.

Bolt's back

Six-time gold medalist Usain Bolt took the track for the first time, and coasted his way into the next round. He'll attempt to win both the 100 and 200-meter races for the third straight Olympics.

Mo better

Great Britain's Mo Farah brushed off a rough fall early on in the 10,000-meter race, coming back to win his third straight gold medal in the event. Farah was accidentally tripped by his British training partner Galen Rupp.

Row, row, row your boat

The U.S. women's rowing team won its third straight gold medal in coxed eight. This team has not suffered defeat since 2006, claiming every world title over a 10-year span.

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