World-leading performances from world champion Shericka Jackson highlighted Jamaica’s strength on the track in Sunday’s final day of the national championships. Jackson, the reigning 200m world champion, completed a superb sprint double after she ran a season’s best 21.71 seconds (-0.5m/s) to win the 200, her second world lead of the weekend after she ran a personal best 10.65 seconds to win the 100 on Friday.

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