Olympic swimming at Rio 2016 concluded on Aug. 13 as the last four races of the games were contested in the pool. From Michael Phelps to Simone Manuel to Lilly King to Maya DiRado, a host of talented swimmers representing Team USA turned in a collection of incredible performances in the water that netted the nation a whopping 33 medals: 16 gold, eight silver, and nine bronze. Here's a glance at some of USA Swimming's most memorable moments from the Rio Olympics.

Michael Phelps earns more hardware, births #PhelpsFace

It's hard to pick a defining moment for Michael Phelps, who is regarded by many as the greatest swimmer of all time. The 31-year old five-time Olympian earned six medals at Rio 2016, bringing his mind-boggling career to total to 28, 23 of which are gold. Highlights included his fourth consecutive gold medal finish in the 200m individual medley, and his career-closing work as the butterfly leg of the 100m medley relay, which he won along with teammates Nathan Adrian, Ryan Murphy, and Cody Miller.

On a more amusing note, Phelps inadvertently created the #PhelpsFace social media phenomenon --akin to gymnast McKayla Maroney's "McKayla is not impressed" face that was turned into memes following her silver medal vault finish at the 2012 Olympics-- when a photo of him appearing to give rival Chad le Clos a dirty look in the warm-up area appeared online.

Katie Ledecky expands her repertoire and her win streak

If Michael Phelps is the greatest male swimmer of all time, Katie Ledecky is well on her way to becoming his female counterpart.

The 19-year old, who shocked the world when she emerged from obscurity to win 800m freestyle gold at age 15 at the 2012 London Olympics, continued her dominance in the pool by sweeping the gold medals in the 200m, 400m, and 800m freestyle events at Rio 2016. She also competed as part of two relay squads, earning gold for one effort and silver for the other. She broke her own world records in both the 400m and 800m events, and continued her remarkable international competition win streak.

Simone Manuel makes history

Although Team USA won a whopping 16 gold medals at Rio 2016 --no other country snagged more than three-- the one that Simone Manuel claimed after winning the 100m freestyle final over a field packed with talent that included Australia's Campbell sisters and co-winner Penny Oleksiak of Canada was one of the most significant. Manuel's gold was the first ever won by an African American woman in an individual Olympic swimming event. 

Ryan Murphy becomes the new king of backstroke

After missing out on a berth on the 2012 Olympic team, Ryan Murphy's coronation as the new king of backstroke took place four years later in Rio as he won both the 100m and 200m backstroke finals.

As if that wasn't enough of an accomplishment, he broke Aaron Peirsol's seven-year old world record while swimming the first leg of the men's 100m medley final on Aug. 14. He finished his time at Rio 2016 with three gold medals.

Lilly King makes waves

Outspoken teen Lilly King drew plenty of attention with her outspoken criticism of chief rival Yulia Efimova's failed drug tests, and in the end, she bested Efimova in the 100m backstroke final to win the gold by a whopping .02.

Anthony Ervin sets a new record

At age 35, Anthony Ervin was something of a long shot to win the frenetic 50m freestyle at Rio 2016, but he did just that, and he did it an incredible 16 years after he first won the same event at the 2000 Olympics in Sydney. Ervin's gold medal makes him the oldest individual Olympic swimming gold medal winner ever. The previous owner of that record? Michael Phelps.

Maya DiRado beats the best

At age 23 and eager to get on with life, Maya DiRado arrived at Rio 2016 ready to compete in her first --and last-- Olympic Games. After scoring bronze and silver in her first two individual events, she went on to upset dominant Hungarian swimmer Katinka Hosszu to take 200m backstroke gold on the penultimate day of swimming at Rio 2016.

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