The Prince of Wales brought traffic to a halt on The Mall to play cricket with some of the game's biggest names.
The impromptu match was staged to celebrate Mumbai hosting his Earthshot Prize, with the ceremony due to be held in the Indian city next month.
England captain Joe Root and West Indies great Brian Lara were among those who took part, playing alongside grassroots cricketers on the famous London thoroughfare.
Former India captains Ajinkya Rahane and Sourav Ganguly also joined the game.
The Earthshot Prize awards £1 million to winners in five categories and aims to discover, reward and finance ideas to help "repair" the planet.
William's first turn came with the ball, bowling at Lara, who pushed away the slow medium deliveries.
The prince then took the bat from Lara, the former West Indies captain who holds the record for the highest first class cricket score of 501 not out.
He swung and missed at several deliveries from Harry Brook, England's white ball captain, and from Ganguly.
One ball was eventually connected with and sent over the heads of players from Backyard Cricket, the internet sensation which promotes the sport at the grassroots level.
Lara praised the prince and said he would be in his starting 11, adding: "Well, I think he underrates himself first of all because you know he's a big football fan, as we all know.
“I think his bowling needs a lot of work, but his batting across the line, I think he’d just be my sort of number six or number seven batter, the guy that comes in at the end, and if he hits a couple of boundaries, he hits a couple of boundaries.”
Among the cricketing greats at the event was ex-England bowler Sir Jimmy Anderson, England’s highest wicket-taker in Test cricket with more than 700 wickets.
From the world of broadcasting was BBC Radio 1 breakfast presenter Greg James, co-host of the popular cricket podcast Tailenders alongside Sir Jimmy and musician Felix White.
Root said about the experience of playing in The Mall: “It was a bit different, it was a challenging wicket.
“But it was a great opportunity, a huge privilege to get the chance to do it and there are some wonderful backdrops in cricket but none quite like this.”
William’s Earthshot project is halfway through its decades-long cycle and has already been staged in London, Singapore, Cape Town, Boston and Rio de Janeiro.
He has managed to attract a host of stars to his cause, from Hollywood stars Leonardo DiCaprio, Matthew McConaughey and Cate Blanchett to broadcaster and naturalist Sir David Attenborough and former prime minister of New Zealand Jacinda Ardern.
Awards are presented in five categories, or Earthshots – Protect and restore nature; Clean our air, Revive our oceans; Build a waste-free world; and Fix our climate.
Among the finalists are Orsted, the Danish renewable energy company behind some of the world’s largest offshore wind projects, Mahindra Last Mile Mobility which produces electric tuk-tuks in India, and Yellowstone to Yukon, which is reconnecting a vast mountain landscape across Canada and the US so wildlife can once again move freely.
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