From sea to shining sea ... and beyond.
Carissa Moore, who competes in international surfing events under the flag of Hawaii, surprised no one by winning the first women's surfing gold medal in Olympic history.
Lydia Jacoby, who hails from Alaska, surprised many people by winning the women's 100m breaststroke.
Also surprising: The U.S. women's volleyball team routed reeling China, while the U.S. women's soccer team could only draw Australia to set up a tricky quarterfinal game against the Netherlands or Brazil.
Also not surprising: China's divers won the women's synchronized platform event, but the U.S. duo of Jessica Parrotta and Delaney Schnell won the race for silver.
In late action: The U.S. women's gymnastics team regrouped for silver after Simone Biles went out with an injury, the U.S. women's softball team also took silver after a loss to Japan, and the U.S. dressage team took a surprise silver.
SEE MORE: U.S. surfing star Carissa Moore wins first Olympic title
The women's 100m breaststroke favorite was defending champion Lilly King, who led early but was passed by South Africa's Tatjana Schoenmaker, who set the Olympic record of 1:04.82 in qualifying. They continued to duel for silver, with Schoenmaker coming out on top, but Jacoby surged past both of them for the win in 1:04.95. Schoenmaker was 0.27 seconds back. King was another 0.32 back, more than two seconds off her world record from 2017, but finished two places ahead of Russian rival Yuliya Efimova.
That was the only gold medal for the U.S. swim team on the day. Regan Smith took bronze in the 100m backstroke, while Ryan Murphy took bronze in the men's 100m backstroke behind a 1-2 ROC finish. Great Britain went 1-2 in the day's other final, the men's 200m freestyle.
SEE MORE: Seward, Alaska goes ballistic for Lydia Jacoby's shock win
Defending Olympic gold medalist and reigning World Cup champion China had a stunning straight-set loss to Turkey in its opener, but the good money would've bet on at least some sort of regrouping against the United States, which stared up at China from the lower steps of the podium in each event.
China did stay even with the Americans through the first set, losing 29-27. The U.S. then took control, winning 25-22 and 25-21 for the sweep.
Jordan Thompson walloped 28 kills on top of four blocks and two aces, both in the third set, for the win.
SEE MORE: Thompson scores 34 in U.S. women's volleyball win over China
AROUND THE GAMES
Boxing (women): U.S. welterweight Oshae Jones took a commanding lead and held out through the third round for a 3-2 decision in the Round of 16 that was more convincing than the final scoreline appears.
Table tennis: After winning her first four matches to move from one of the lowest possible seeds into the Round of 16, U.S. player Liu Juan's run came to an end just short of the women's singles quarterfinals, which no U.S. player has reached since 2008.
Rugby: The U.S. men led Great Britain 21-0, but a costly infraction helped the British rally for a 26-21 quarterfinal win.
Shooting: Mary Tucker and Lucas Kozeniecky, both sixth in their respective individual events, teamed up for silver in the debut of mixed team air rifle.
Boxing (men): U.S. welterweight Delante Johnson controlled the action to advance to the quarterfinals. Also, Moroccan boxer Youness Baalla attempted to bit New Zealand's David Nyika. The New Zealand boxer won the bout.
Judo: One day after Canada won its first medal in women's judo, Catherine Beauchemin-Pinard won the nation's second.
Canoe/kayak: Women's kayak slalomist Ricarda Funk won Germany's first gold medal in this year's Games.
Weightlifting: Records continued to tumble, with Kuo Hsing-Chen of Chinese Taipei setting women's 59kg records for snatch (103kg), clean and jerk (133kg) and total (236kg).
Beach volleyball: The ageless duo of Phil Dalhausser and Nick Lucena upset Brazil's Alison Cerutti and Alvaro Filho. In women's pool play, April Ross and Alix Klineman swept Spain's Liliana Fernandez and Elsa Baquerizo.
SEE MORE: USA's Dalhausser, Lucena rebound with big win over Alison, Alvaro
Handball: Host Japan, which usually doesn't have a qualified team in this event, upset Montenegro in women's action.
Mountain bike: Jolanda Neff led a Swiss sweep in the women's event, finished more than a minute ahead of her compatriots.
Softball: After a few near-misses and a longer wait during the sport’s exile, Canada won its first bronze medal.
Archery: British archer Bryony Pitman upset Chinese Taipei’s Ya-Ting Tan and Mexico’s Aida Roman as the women's archery competition got underway.
Tennis: Naomi Osaka, the home-country hero who lit the Olympic cauldron, lost 6-1, 6-4 to Marketa Vondrousova of the Czech Republic. In women’s singles, the top three seeds are out, as are all of the Americans, but U.S. doubles teams Austin Krajicek/Tennys Sandgren and Bethanie Mattek-Sands/Jessica Pegula advanced.
Surfing: U.S. teen Caroline Marks reached the semifinals and wound up in fourth. Italo Ferreira won the men's event despite breaking his board on his first wave.
SEE MORE: Italo Ferreira snaps surfboard in gold medal match
Canoe/kayak (women's kayak slalom): Gold - Ricarda Funk (GER), Silver - Maialen Chourraut (ESP), Bronze - Jessica Fox (AUS)
Cycling (women's mountain bike): Gold - Jolanda Neff (SUI), Silver - Sina Frei (SUI), Bronze - Linda Indergand (SUI)
Diving (women's synchronized platform): Gold - Chen/Zhang (CHN), Silver - Parratto/Schnell (USA), Bronze - Agundez/Orozco (MEX)
Equestrian (team dressage): Gold - Germany, Silver - United States, Bronze - Great Britain
Fencing (women's team epee): Gold - Estonia, Silver - South Korea, Bronze - Italy
Gymnastics (women's team event): Gold - ROC, Silver - United States, Bronze - Great Britain
Judo (women's 63kg): Gold - Clarisse Agbegnenou (FRA), Silver - Tina Trstenjak (SLO), Bronze - Catherine Beauchemin-Pinard (CAN), Bronze - Maria Centracchio (chehn-tra-chee-oh) (ITA)
Judo (men's 81kg): Gold - Nagase Takanori (JPN), Silver - Saeid Mollaei (MGL), Bronze - Matthias Casse (BEL), Bronze - Shamil Borchashvili (AUT)
Shooting (mixed team air pistol): Gold - Jiang/Pang (CHN), Silver - Batsarashkina/Chernousov (ROC), Bronze - Kostevych/Omelchuk (UKR)
Shooting (mixed team air rifle): Gold - Yang/Yang (CHN), Silver - Tucker/Kozeniesky (USA), Bronze - Karimova/Kamensky (ROC)
Softball: Gold - Japan, Silver - USA, Bronze - Canada
Surfing (women's): Gold - Carissa Moore (USA), Silver - Bianca Buitendag (RSA), Bronze - Amuro Tsuzuki (JPN)
Surfing (men's): Gold - Italo Ferreira (BRA), Silver - Kanoa Igarashi (JPN), Bronze - Owen Wright (AUS)
Swimming (women’s 100m breaststroke): Gold - Lydia Jacoby (USA), Silver - Tatjana Schoenmaker (RSA), Bronze - Lilly King (USA)
Swimming (men’s 100m backstroke): Gold - Evgeny Rylov (ROC), Silver - Kliment Kolesnikov (ROC), Bronze - Ryan Murphy (USA)
Swimming (women’s 100m backstroke): Gold - Kaylee McKeown (AUS), Silver - Kylie Masse (CAN), Bronze - Regan Smith (USA)
Swimming (men’s 200m freestyle): Gold - Tom Dean (GBR), Silver - Duncan Scott (GBR), Bronze - Fernando Scheffer (BRA)
Taekwondo (women's 67kg): Gold - Milica Mandic (SRB), Silver - Lee Da-Bin (KOR), Bronze - Bianca Walkden (GBR), Bronze - Althea Laurin (FRA)
Taekwondo (men's 80kg): Gold - Vladislav Larin (ROC), Silver - Dejan Georgievski (MKD), Bronze - Rafael Alva (CUB), Bronze - In Kyo-Don (KOR)
Triathlon (women's): Gold - Flora Duffy (BER), Silver - Georgia Taylor-Brown (GBR), Bronze - Katie Zaferes (USA)
Weightlifting (women's 59kg): Gold - Kuo Hsing-Chun (TPE), Silver - Polina Guryeva (TKM), Bronze - Ando Mikiko (JPN)
Weightlifting (women's 64kg): Gold - Maude Charron (CAN), Silver - Giorgia Bordignon (ITA), Bronze - Chen Wen-Huei (TPE)
SEE MORE: Jolanda Neff dominates in Swiss women's mountain bike sweep
3x3 basketball (women's pool round): Japan def. United States 20-18, China def. Mongolia 21-9, France def. Romania 22-12, ROC def. Italy 17-9
3x3 basketball (women's quarterfinals): China def. Italy 19-13, France def. Japan 16-14 (byes: United States, ROC)
3x3 basketball (men's pool round): Belgium def. Poland 16-14, Japan def. China 21-16, Serbia def. ROC 21-10, Latvia def. Netherlands 22-18
3x3 basketball (men's quarterfinals): ROC def. Netherlands 21-19, Latvia def. Japan 21-18 (byes: Serbia, Belgium)
Basketball (women): Japan def. France 74-70, United States def. Nigeria 81-72, Belgium def. Australia 85-70, China def. Puerto Rico 97-55
Field hockey (men): Australia def. Argentina 5-2, Japan tied New Zealand 2-2, India def. Spain 3-0, Germany def. Great Britain 5-1, Belgium def. South Africa 9-4, Netherlands def. Canada 4-2
Handball (women): Japan def. Montenegro 29-26, Brazil def. Hungary 33-27, Sweden def. ROC 36-24, Netherlands def. South Korea 43-36, Norway def. Angola 30-21, France vs. Spain
SEE MORE: Japan stuns Montenegro in women's handball
Rugby (men's pool round): Canada def. Japan 36-12, Fiji def. Great Britain 33-7, Argentina def. South Korea 56-0, New Zealand def. Australia 14-12, Ireland def. Kenya 12-7, South Africa def. United States 17-12
Rugby (men's 9-12 placement games): Ireland def. South Korea 31-0, Kenya def. Japan 21-7
Rugby (men's quarterfinals): New Zealand def. Canada 21-10, Great Britain def. United States 26-21, Argentina def. South Africa 19-14, Fiji def. Australia 19-0
Soccer (women): United States tied Australia 0-0, Sweden def. New Zealand 2-0, Canada tied Great Britain 1-1, Japan def. Chile 1-0, Netherlands def. China 8-2, Brazil def. Zambia 1-0
Volleyball (women): ROC def. Argentina 3-0, United States def. China 3-0, Serbia def. Japan 3-0, Italy def. Turkey 3-1, Brazil def. Dominican Republic 3-2, South Korea vs. Kenya
Water polo (men): United States def. South Africa 20-3, Spain def. Montenegro 8-6, Serbia def. Kazakhstan 19-5, Greece tied Italy 6-6, Hungary def. Japan 16-11, Australia def. Croatia 11-8