北京时间8月25日，2024年全国夏季游泳锦标赛展开争夺上海丝凡克商贸有限公司，奥运冠军孙杨亮相男子400米自由泳决赛，孙杨决赛游出3分49秒58夺得冠军，拿到复出后的第一冠，徐海博以3分50秒14收获亚军。
经历长达1675天的禁赛，孙杨在这次全国夏季游泳锦标赛迎来自己的复出之战，本次赛事孙杨只报名男子400米自由泳一个单项。8月25日上午，孙杨出战400米自由泳预赛，孙杨游出3分54秒98，以总成绩第二名晋级到决赛。
八名选手获得男子400自决赛资格，分别是徐海博、孙杨、陈声鑫、陈梦翔、邱子傲、徐一舟、张中信、梁家玥，徐海博预赛游出3分52秒82，邱子傲则在预赛游出3分56秒93。
孙杨决赛在第5道出发，发令枪响后孙杨顺利出发，第一个50米结束徐一舟排名第一，孙杨没有跻身前两名。100米结束徐一舟守住第一位，而150米结束孙杨成绩跃居到第二位，成绩为1分25秒14，当200米半程结束，孙杨游出1分54秒44，依然排名第二位。
250米游程结束，孙杨分段成绩是2分23秒56，名次跃居到第一位。300米结束，孙杨守住第一排名，成绩是2分53秒07。350米游完，孙杨游出3分21秒87，暂居第一位，最后50米冲刺，孙杨牢牢守住第一位，最终率先冲刺到终点，成绩是3分49秒58，夺得冠军。
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