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In swimming, competition analyses have been frequently performed according to three segments of the race, equal for all competitors. However, individual distance measurements during start and turn race segments have been scarcely assessed. The aim of the present study was: 1) to verify the validity and reliability of a 2D-DLT based system for competition analysis in swimming and, 2) to compare it with the commonly used technique. Higher values of accuracy (RMSE=0.05 m) and reliability (CV<1%) were obtained. 95% Limits of agreement revealed differences no longer than one frame (0.04 s) between the two compared procedures. The results showed that the 2D-DLT procedures are valid for competition analysis in swimming and that the differences between 2D-DLT and scaling technique are acceptable. [ABSTRACT FROM AUTHOR]