Boris Johnson is set to launch a programme of free activities to encourage Londoners to get more involved in basketball.
It comes ahead of The Euroleague Final Four basketball tournament held next month at the O2.
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The ComRes survey for ITV News and LBC showed the Labour candidate increasing his overall lead over Conservative rival Zac Goldsmith.
The latest poll for ITV London and LBC shows Sadiq Khan leads Zac Goldsmith by 45% to 36% on first preference votes.
Corbyn was unveiling a poster less than a mile away as Khan gave his final campaign speech to party supporters in London.