CHARLOTTE, N.C. (AP) — Ryan Lochte was all smiles Saturday night, calling it a "fun day" in the pool after getting a chance to swim some events he doesn't normally enter.

But when it came to saying what events he will enter at the Olympic trials in June in preparation for his fourth Olympic Games in Rio de Janeiro, Lochte clammed up and turned coy.

"I have certain events that I want to do at trials, but I'm going to keep that myself and just wait until the day comes," said Lochte, who lives and trains in Charlotte.

Lochte finished second behind Russian-born Arkady Vyatchanin in the 100 backstroke Saturday at the Arena Pro Swim Series in what has become his home pool. He also was sixth in the 50 butterfly, which is not an Olympic event but something he wanted to try.

"It was the shortest day I have ever had in the pool," Lochte said, laughing. "Ten times shorter than the 400 (individual medley, which he won Friday night)."

Lochte said he wasn't particularly pleased with his times, he felt like he put forth good effort.

"I just have to tune up my strokes and making them a lot crisper — pretty much everything," Lochte said. "We're six weeks out (from the trials) so it's time to get zeroed in."

Vyatchanin, who parted ways with the All-Russian Swimming Federation, touched in 54.80 seconds to take the 100 backstroke. Lochte, an 11-time Olympic medalist who has won four golds, was close behind in 55.22.

"It was pretty slow but it was a win, so I will take it," said Vyatchanin, who trained for almost two years with Lochte in Florida.

Cody Miller dominated the 200 breaststroke, winning by more than 3 seconds in a time of 2:12.22 over Mauro Castillo Luna.

Anthony Ervin, who spent part of the night signing books for fans, won the 50 freestyle in 21.98 seconds after outkicking Canada's Santo Condorelli.

Ervin's memoir, entitled "Chasing the Water Dragon," hit the bookshelves last month.

"We've been doing a lot of technique work the last few weeks," Ervin said. "Technique work with the training, as well as trying to get that start down. . I think it's been paying off. I'm not only hopeful, but I'm enthusiastic about the next few weeks."

Jonathan Gomez took the 200 butterfly, Conor Dwyer won the 400 free, and Condorelli the 50 butterfly.

Dwyer, who led wire-to-wire to take his second win at the meet after winning the 200 free on Friday, said he's eager for the trials.

"I've put in almost two months up at altitude, and I'm just excited to taper," Dwyer said.

On the women's side, Olympic gold medalist Dana Vollmer had a strong showing in the 50 butterfly, winning in 25.87 after finishing in fifth place in the 50 freestyle.

"I didn't have that spark that I wanted," Vollmer said of the 50 free.

That changed in her second race.

"I tried to think about having really good contact with the water... and feeling the water the whole way through my stroke," Vollmer said about the 50 butterfly. "It felt pretty good going along. So I'm really happy with that result."

Leah Smith set the only meet and pool records Saturday, finishing the 400 free in 4:05.21.

Other winners included Cammile Adams in the 200 butterfly, Chantal Van Landeghem in the 50 freestyle, Kylie Masse in the 100 backstroke, Anne Lazor in the 200 breaststroke.

The meet will end Sunday.