The British athlete won his latest world-level honor and initial after winning the world title back in 2022.
The Scottish runner marked his comeback to a global podium with championship 1500-meter second place, however British team-mate the defending champion's championship bid was ruined by a physical setback in a dramatic race in Japan.
The 31-year-old, the 2022 world titleholder, secured redemption on his comeback to the international scene, having battled with setbacks and been absent from the previous two major championships.
Wightman collapsed with fatigue after reaching the finish before gazing up at the big screen, which revealed that Portugal's Nader had edged him to gold by two-hundredths of a second in a dramatic finish.
It was disappointment for Kerr, who was aiming to become only the fourth ever man to retain the 1500m title, but was denied the chance after pulling up midway through the race and managing to limp over the finish.
Kerr, who had placed himself at the rear of the race, halted in pain on the second-to-last lap but pushed himself to hobble around to the finish in last place.
Ahead, Wightman made his bid for gold. Although he came up painfully short, it is a silver medal which will seem as good as gold after the difficulties of the past few seasons.
Great Britain had to wait until the fifth day of the championships in Tokyo to celebrate medal success, but the athlete's impressive silver boosted them to 17th in the standings on the day.
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- Athletics