Robbie Renwick had the home crowd on their feet at the Olympics with an aggressive swim to qualify for the 200m freestyle semi-finals in the Aquatic Centre.
The Scot, who narrowly failed to reach Saturday's 400m freestyle final, took it out from the front to touch second in his heat and sixth overall in 1:46.86.
Renwick, who reached the Olympic final four years ago, said: "It went pretty good, felt really smooth this morning. It was a solid heat swim, fastest I've been in the morning so I'm in good shape and hopefully get into that final tonight.
"The home crowd there was fantastic cheering me on and I think that really helped me on that swim this morning. That's one of the advantages of having a home Olympics, it's fantastic having the home crowd there and hopefully I can step it up again tonight and get into the final.
"I think it will take a low 1.46 but I feel like I am capable of doing that so fingers crossed."
Of whether Britain can get their first title in the pool today, he added: "Yeah we have a really exciting day today with Rebecca (Adlington) swimming. I know she's in great shape so anything can happen."
Ieuan Lloyd was 19th overall in 1:48.52 while Sun Yang and Ryan Lochte, who both won titles on Saturday night, battled it out with the Chinese swimmer quickest through.
World 50m backstroke record holder Liam Tancock safely made it into the 100m semis, qualifying eighth in 53.86 although Chris Walker-Hebborn was 20th.