Meilutyte, who swam a world best in the semi-finals of the 100 breaststroke on Monday, clocked a time of 29.48 seconds to beat the previous best of 29.78 set by Yuliya Efimova of Russia in qualifying earlier on Saturday.
Efimova was swimming in the next lane to the 16-year-old Meilutyte in their 50 breaststroke semi-final and finished in 29.88.
(Reporting by Iain Rogers, editing by Martyn Herman)
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