For Dumais, it'll be his third trip to the Olympics, having also competed in 2000 and 2004. Loukas will make her first trip to the Games.
Both divers won in convincing fashion, with Dumais scoring 1552.90 points to runner-up Chris Colwill's (Brandon, Fla.) 1465.10. Loukas outdistanced second-place Nancilea Foster (Conroe, Texas) 1092.10-1002.85.
Dumais and Loukas each started the competition with bonus points for their performances at the 2008 World Cup, but both proved the points were not needed as their margins of victory were far wider than the 30 and 25 points each received for their fourth-place efforts at the World Cup.
Dumais, who had five 10s in Friday's semifinals, earned two perfect marks on his front 3 ½ pike and scored as high as 9.0 or 9.5 on four of his other five dives.
"It's a relief. Four years ago when Athens didn't go so well, this was the first thing I thought about. And now it's done. I climbed the ladder and I am close to my goal," Dumais said. "I felt it was a lot easier to keep motivated this time. I was able to take control of my emotions. My coaches and I did it right this time. We knew what we had to do."
Loukas had already secured her victory before she even completed her final dive, as she was eight points ahead of Foster after all other divers had finished. Having clinched the berth, Loukas went out and hit her front 2 ½ with 1 ½ twists for 81 points, by far her best dive of the day. She earned two 9.5s and four 9.0s on the dive.
"It still hasn't sunk in yet. I'm a bit overwhelmed right now," said Loukas, who entered the day nearly 50 points ahead of the rest of the field. "I tried really hard not to focus (on the lead) and focus that we were all starting even, at zero."
Colwill upgraded his dive list for the finals and finished the day with his reverse 2 ½ with 2 ½ twists, a difficult dive with a 3.9 degree of difficulty that very few divers perform. He scored as high as 8s on the dive, which he's competed only one other time. Colwill also had the highest single-dive score of the afternoon, earning 96.25 points on his reverse 3 ½ that resulted in three 9.5 marks from the judges.
Only the winners of each event earn Olympic berths. The second individual spot, as well as all four synchronized diving teams, will be chosen at a selection camp in Knoxville, Tenn., from July 2-6. The top six divers on each event are invited to the camp.
Rounding out the top six on men's three meter were Justin Wilcock (Smithfield, Utah) at 1363.40, Jevon Tarantino (Boca Raton, Fla.) at 1362.80, Kristian Ipsen (Clayton, Calif.) at 1304.45, and Burkley Showe (Columbus, Ohio) 1267.25.
The other top six finishers on the women's side were Allison Brennan (Huntington Beach, Calif.) at 994.15, Ariel Rittenhouse (Santa Cruz, Calif.) at 978.65, Kelci Bryant (Chatham, Ill.) at 944.60, and Tory Ishimatsu (Seal Beach, Calif.) at 933.60.
Men's and women's 10-meter finals are Sunday at 2:30 p.m.. NBC will provide coverage from 3-6 p.m.