Watch Michael Phelps swim his last individual race at 2:38PM EST on August 3. The record-setting Olympian will swim the 100-Meter Butterfly, which will be among his last before he retires. Click here to see NBC's live stream of the event from the Aquatics Center in London.

The US swimmer's eyes reportedly swelled with tears as he stood on the podium for one of the final times in his Olympic career.

"Going into the relay, it'll probably kick into my head more and more," Phelps said regarding his retirement.

Phelps entered the 2012 London Olympics schedule with a slow start compared to his 8 gold medals wins in Beijing 4 years ago. However, after winning his 20th medal, Phelps also managed to finish first in the 100-Meter Butterfly Semi-Finals on Thursday. The US Olympian has 2 more swimming events left on the schedule for a possible advance to his record-breaking career.

"Phelps is out of our league. It's not fair that I'm talking for everybody, but I'm expecting something special tomorrow," Milorad Cavic, a medal contender from Serbia, said.

"I think he's going to go 50.5. I'm going to have to go 50.9 to assure myself a medal."

Phelps clocked in at 50.86 seconds in the 100 Fly Semi-Finals, beating Chad de Clos, who won the second heat.

Phelps earned another victory during the Thursday events winning the 200-Meter Individual Medley Final against Ryan Lochte.

Phelps now holds a record for being the first male swimmer to win the same Olympics event three times in a row. He clocked in at 1 minute, 54.27, beating Lochte who came in third.

"It's a relief to win an individual gold," Phelps said, smiling. "It's something pretty cool and special to threepeat."

Tags
Usa swimming, London 2012 olympics