The highs and lows of the Olympic trials were on display at the Aquatics Centre when Gemma Spofforth and Georgia Davies' joy at qualifying in the 100 metres backstroke contrasted with Lizzie Simmonds' devastation after missing the cut.
A top-class swimmer was going to miss out, with three women vying for two places on the Great Britain team.
Swansea ITC athlete Davies is a sprint specialist and touched first after 50m, with Simmonds second and Spofforth fifth. However, Spofforth came back over the second length and with little to choose between the trio, the Florida-based swimmer inched ahead, securing victory with the best touch.
The former world champion finished in one minute 00.19 seconds, 0.02secs ahead of a determined Davies with both women inside the qualification time. Simmonds was in lane four sandwiched by her two rivals but the European silver medallist could not respond, a further 0.22 adrift.
Liam Tancock also booked his place in the 100m, his only individual race in London given the 50m, in which he is world champion, is not an Olympic event.
The 26-year-old was out on his own and touched in 53.16, a time only he has ever bettered domestically. Chris Walker-Hebborn was second but his time of 54.46 was outside qualification.
Kate Haywood returned from Australia, where she trains alongside 100m butterfly champion Ellen Gandy under Rohan Taylor in Melbourne. The 2010 Commonwealth bronze medallist showed much-improved strength in the closing metres to make the GB team in 1:08.07. Stacey Tadd, second in 1:08.96, will have to try again in Sheffield in June.
Robbie Renwick booked his second spot on the team when he won the 200m freestyle to add to his 400m title. The 23-year-old led from start to finish with his time of 1:47.33, inside that required by British Swimming although Ieuan Lloyd was 0.31 outside.
Caitlin McClatchey leads the 200m freestyle into Tuesday's final in 1:57.45 although Sweden's Sarah Sjoestroem produced a time of 1:55.23 - lower than the British record - in the final featuring overseas swimmers.
Hannah Miley heads the 200m individual medley final while British record holder Michael Rock is fastest into the 200m butterfly final.
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