Swimming at the 2016 Rio Olympics began Aug. 6 with preliminary round action from the Olympic Aquatics Stadium. Team USA came off the blocks on day one of the Games in strong fashion, with several swimmers --including Chase Kalisz, who dominated in the men's 400m individual medley (IM)-- successfully advancing further in their respective events. Medals will be on the line as four finals are contested during the evening hours.

Olympic swimming results: Chase Kalisz posts best qualifying time

Kalisz edged Japan's Daiya Seto to post the fastest qualifying time in the men's 400m IM, 4:08.12 to 4:08.47. The rest of the pack finished more than a second behind the two men, who will likely battle it out for the gold medal during tonight's final, which is set to begin at 9:03 PM Eastern at the Olympic Aquatics Stadium. The eight qualifiers for the final are:

  • Kalisz, 4:08.12
  • Seto, 4:08.47
  • Kosuke Hagino, Japan, 4:10.00
  • Jay Litherland, USA, 4:11.10
  • Max Litchfield, Great Britain, 4:11.95
  • Thomas Fraser-Holmes, Australia, 4:12.51
  • Travis Mahoney, Australia, 4:13.37
  • Joan Lluis Pons Ramon, Spain, 4:13.55

Katinka Hosszu just misses world record

In the women's 400m IM, Hungary's Katinka Hosszu dominated the rest of the field, swimming more than three seconds ahead of world record pace until the final freestyle leg, when she fell a tick behind pace just before hitting the wall.

She still finished more than four seconds ahead of her nearest competitor and enters tonight's final heavily favored to take gold. If she succeeds, it will be sweet redemption for Hosszu, who placed fourth in the event at the London Olympics in 2012.

The qualifiers for the women's 400m IM at the Rio Olympics include:

  • Hosszu, 4:28.58
  • Mireia Bellmonte Garcia, Spain, 4:32.75
  • Maya DiRado, USA, 4:33.50
  • Hannah Miley, Great Britain, 4:33.74
  • Aimee Willmott, Great Britain, 4:34.08
  • Elizabeth Beisel, USA, 4:34.38
  • Sakiko Shimizu, Japan, 4:34.66
  • Emily Overholt, Canada, 4:36.54

US men advance in 400m free

Both men competing for Team USA advanced successfully to tonight's 400m freestyle final, with Conor Dwyer posting the fastest qualifying time of the bunch (3:43.42) and Connor Jaeger, the seventh (3:45.37).

The qualifiers for tonight's Olympic Swimming final include:

  • Dwyer, 3:43.42
  • Mack Horton, Australia, 3:43.84
  • Gabriele Detti, Italy, 3:43.95
  • Sun Yang, China, 3:44.23
  • David McKeon, Australia, 3:44.68
  • James Guy, Great Britain, 3:45.31
  • Jaeger, 3:45.37
  • Jordan Pothain, France, 3:45.43.

In a surprising result, Park Taehwan and South Korea and Canada's Ryan Cochrane --who were expected by oddsmakers to be podium contenders-- did not qualify.

American ladies rank second in relay

In the evening's fourth and last gold medal final in Olympic swimming, the American women will swim the 4x100m freestyle relay. The team ranked second behind Australia (3:32.39 to 3:33.59) during qualifiers. The rest of the field will feature teams from Canada, Italy, the Netherlands, Sweden, Japan, and France.

Olympic swimming at the 2016 Rio Summer Games continues tonight, per the posted schedule.

Check back for results.

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