Lamont Marcell Jacobs trumped American rival Christian Coleman for 60m gold on the second day of the World Indoor Championships in Belgrade on Saturday, while Yaroslava Mahuchikh claimed a memorable high jump title for war-ravaged Ukraine. Jacobs had been a surprise winner of track's blue riband event at last summer's Tokyo Games where he also won gold as part of Italy's 4x100m relay quartet. The Italian barely raced after his Japan exploits, but his return to the indoor circuit did not go unannounced and he lived up to all his promise in the Serbian capital.