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WATCH: Top highlights from Day 2 at the Rio Olympics

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Day 2 in Rio saw the first gold medal -- and vintage form -- for Michael Phelps in the men's swimming 4x100m freestyle relay. It saw Katie Ledecky smash the world record in the women's 400m freestyle while capturing her first gold medal of Rio. It saw Simone Biles, Aly Raisman and Gabby Douglas put on a display of dominance in the gym. It saw history by Diana Taurasi from downtown. It saw a pair of stunning upsets on the tennis courts. And it saw a must-see-to-believe finish in the women's cycling road race.

Sound fun? It certainly was! Relive the day by watching all the top highlights below.

World's 112th ranked judoka upsets medal contender

Serena Williams routs first-round opponent in women's singles ...

... then loses her first-ever Olympic doubles match with sister Venus

American archers cruise into finals

U.S. weightlifter Morghan King sets American record for snatch

16-year-old Brazilian gymnast Flavia Saraiva thrills the hometown crowd

Rafael Nadal battles through wrist injury to reach second round of men's tennis

Heartbreak for Mara Abbott in must-see wild finish to women's cycling road race

Diana Taurasi ties Olympic three-point record as U.S. women rout Senegal

Phil Dalhausser, Nick Lucena win in their debut as Olympic partners

Canada shocks U.S. men in three sets in indoor volleyball opener

U.S. fencer Alexander Massialas captures silver medal

U.S. women's rugby plays Australia to tie, but knocked out in quarters by New Zealand

World No. 1 Novak Djokovic upended in first round by Juan Martin Del Potro

Katie Ledecky sets Olympic 400m freestyle world record in prelims ...

... then shatters the world record while capturing gold in the final

Dana Vollmer snags bronze medal in 100m butterfly as Sarah Sjostrom wins gold

Great Britain's Adam Peaty sets world record, wins 100m breaststroke gold

British gymnast Ellie Downie suffers scary injury on floor routine

Gabby Douglas sparkles in women's gymnastics qualifications ...

... but not as much as Simone Biles, who soars above the competition ...

... or Aly Raisman, who qualifies for the all-around final for the second straight Olympics

Michael Phelps earns 19th career gold medal as U.S. men win 4x100m freestyle relay