Costa Rica participated at the 2018 Summer Youth Olympics in Buenos Aires, Argentina from 6 to 18 October 2018.
Beach volleyball
Costa Rica qualified a boys' based on their performance at the 2018 AFECAVOL Zone U19 Championship.
Boys' tournament - 1 team of 2 athletes
AthletesEventPreliminary roundRound of 24Round of 16QuarterfinalsSemifinalsFinal / OppositionScoreRankOppositionScoreOppositionScoreOppositionScoreOppositionScoreOppositionScoreRankAlexandre LezcanoCriforth FallasBoys' L 0-2 W 2-0 W 2-02 W 2-0 L 0-2did not advance
Fencing
Costa Rica was given a quota to compete by the tripartite committee.
Girls' Épée – Karina Dyner
Futsal
Boys' tournament
Group stage
Gymnastics
Artistic Costa Rica qualified one gymnast based on its performance at the 2018 American Junior Championship.
Girls' artistic individual all-around - Camila Montoya
Swimming
Costa Rica qualified 2 athletes (1 boy and 1 girl) to compete in swimming.
Boys AthleteEventHeatsSemifinalsFinalTimeRankTimeRankTimeRankJosé David Solis100 m breaststroke1:06.3229 did not advance200 m breaststroke2:24.37 25 did not advance
Girls AthleteEventHeatsSemifinalsFinalTimeRankTimeRankTimeRankBeatriz Padrón100 m freestyle58.6632 did not advance50 m butterfly27.561128.1816 did not advance100 m butterfly1:02.07131:01.9914 did not advance Girls: Beatriz Padrón (Women's 50m Free, 50m and 100m Butterfly)
References