Olympic 2016 Results: Tracking Medal Count for Each Country on Sunday

The 2016 Summer Olympics in Rio de Janeiro are in full swing, and the medals are already starting to add up.

The USA, Japan and China were tied at five for the most medals after Day 1, while Australia and Hungary finished with the most gold medals, earning two apiece.

Hungary's Katinka Hosszu may have provided the highlight of the games so far, as she not only crushed the competition in the pool in the 400-meter individual medley, she embarrassed that yellow line marking the world record, too.

Hosszu smashed the old mark, set by China's Ye Shiwen during the 2012 games in London, by more than two seconds. American Maya DiRado finished second and nearly five seconds behind the winner.

The Associated Press shared a picture of Hosszu after the dominant performance.

"I knew Katinka was very far ahead, so I didn’t worry about her," DiRado said, per USA Today's Dan Wolken. "I just tried to dig the last 50. I got silver and I’m thrilled with that."

DiRado, a 23-year-old American, says this will be her first and last Olympics, per Wolken. And she's happy with her performance after posting a career-best time and earning a spot on the medal stand.

On the men's side, Australian Mack Horton took home gold in the 400-meter freestyle, edging out Sun Yang of China. The two have a brewing rivalry, which was apparently on display when Yang reportedly splashed Horton during training days before the games.

"It kind of got played up in the media," Horton said, per Phil Lutton of the Sydney Morning Herald. "He just kind of splashed me but I ignored him because I don't have time or respect for drug cheats. He wasn't too happy about that so he kept splashing me. I just got in and did my thing."

Horton's reference to a three-month doping suspension Yang served in 2014 and Horton's win in this event will likely add fuel to the fire.

His teammates on the women's side cruised to a world record in the 400-meter freestyle relay, capping off a strong start for the Aussies in the water.

Outside the pool, Vietnam's Xuan Vinh Hoang made history by winning his country's first gold medal. The Olympic Channel shared a photo of Vinh Hoang celebrating his 10-meter air pistol victory on the medal stand.

As the games continue over the next two weeks, follow Bleacher Report for updates, analysis, highlights and live updates on the medal count.