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Britain's Lizzie Simmonds made it through to the final of the 200m backstroke but team-mate Gemma Spofforth narrowly missed out on joining her in Saturday's race.
Spofforth, who was fourth in the 100m event, finished in 2:09.19 for ninth place overall.
"It was tough getting up for that race after last night but I couldn't be happier with how it went," said Simmonds. "I've made an Olympic final. It's the stuff you dream of.
"Anything can happen now, there are some tough girls in there so we'll have to see. I'm very excited."
Disappointing
That was the lone high point for Team GB on a Friday morning of disappointments at the Water Cube.
Gregor Tait finished eighth in the 200m backstroke with a swim just outside his British record time of 1:57.00.
"The whole point was to make the final," said Tait. "That was the fastest final ever and probably will be for some time.
"I didn't expect to win or get a medal. I just wanted to go out there and have some fun. I am not disappointed because I made the final in the first place.
"It is still the fourth fastest I have ever been but I'm not doing the 200m back again - I'm too old for the training.
"I don't know what I'm going to do, I might try some sprinting, but 200 back is too much for me now."
Fran Halsall finished eighth in the women's 100m freestyle in a time of 54.29secs, outside the national record time she set in the heats.
"I brought myself up from not being in a position beforehand to make the final to making it so you have to take a bonus from that," said Halsall.
"I'm not really happy with how I swam this morning but I gave it my best shot. It was a bit hard at the beginning when everyone was cheering as they said take your marks, it was a bit of a surreal experience.
"I tried my best and that is all I can do. My time will come in four years."











