Olympic swimming trials 2016 results: Michael Phelps will defend 100-meter butterfly gold in Rio

Michael Phelps will get a chance to defend his 100-meter butterfly Olympic gold medal in Rio by finishing in first place at the USA Swimming Olympic trials on Saturday. Phelps posted a time of 51 seconds in the event, just ahead of Tom Shields who finished in 51.20.

Shields also finished second to Phelps in the 200-meter butterfly, which held its finals earlier in the week. Phelps can become the first swimmer to win four consecutive gold medals in the same event -- and will also have a chance in the 200-meter individual medley, which he also has already qualified for.

However, Phelps will have to contend with Ryan Lochte in that event, as it’s the only individual event that Lochte qualified in.

Also on Saturday, Katie Ledecky clocked an impressive time of 8:10.32 in the 800-meter freestyle, taking the win by a massive margin. She took gold in the event in London in 2012, and will likely successfully defend it in Rio. She owns the 11 fastest performances in history in that event. Leah Smith will join her in Rio after finishing second in 8:20.18 on Saturday.

Ledecky has already qualified in the 200- and 400-meter freestyle races, as well, and is the heavy favorite to take gold in all of them in Rio.

Missy Franklin also got some good news on Saturday. After being the most-active swimmer in the 2012 Olympics -- taking home four golds and a bronze across seven events -- she will only have three opportunities at Olympic gold in Rio.

One of those opportunities was solidified on Saturday, when she finished second in the 200-meter backstroke finals, just behind Maya DiRado, who is also going to Rio. Franklin has also qualified in the 200-meter freestyle along with Ledecky, and will also be competing in the 4x200-meter freestyle relay.

In the men’s 50-meter freestyle finals on Sunday, Nathan Adrian came out on top with a time of 21.51 seconds. He will be joined by Anthony Ervin, who shared a gold medal in the event in the 2000 Olympics. His time was 21.98 in those Olympics, and he was faster than that in his second-place effort at Saturday’s trials.