Tokyo 2020 Day 13: All the gold medals Australian teen win's men's park skateboarding

27 medals up for grabs on Day 13 of the Olympic Games

Day 13 of the Tokyo Olympics and we have already witnessed the "unbeatable" Florian Wellbrock power to gold in the men's 10km marathon swimming competition.

The German set the pace early on and holding his lead all the way to the finish.

Wellbrock, who claimed bronze in the men's 1,500m freestyle swimming event, finished in a time of 1 hour, 48 minutes, 33.7 seconds, more than 25 seconds ahead of Hungary's Kristof Rasovszky. Italian Gregorio Paltrinieri claimed bronze.

Rasovszky, who said he had trained in tough conditions to prepare for the Games, conceded he had no chance of catching Wellbrock.

"Florian was unbeatable today," he said. "I tried to be the best of the rest."

Flying Australian teen Keegan Palmer claimed the inaugural men's park skateboarding Olympic gold medal in stunning fashion with two giant scores in the final on Thursday.

Palmer, 18, threw down the gauntlet with 94.04 points in his first run before incredibly bettering his score to 95.83 in his third and final routine.

"I put in a lot of hard work over the last couple of years," said Palmer.

"It paid off today and I'm so grateful to be able to bring the gold back to Australia. It means the world to me because that's where it all started."

The San Diego-based Aussie pulled some huge airs at Ariake Urban Sports Park and he finished well clear of Brazilian silver medallist Pedro Barrios's 86.14 and America's Cory Juneau, who claimed bronze with 84.13.

"I just went in planning to put down a solid run in the first run, and then work on making it better if I needed to," said Palmer.

"I can't believe I'm here now. I put a lot of hard work into that one run and it paid off."

American Heimana Reynolds, the world number one and reigning world champion, did not reach the final after failing to complete any of his three rides in qualifying.

Grant Holloway of the United States took the silver medal while Ronald Levy of Jamaica won the bronze.

The United States failed to make the Olympic men's 4x100 metres relay final after a ragged run saw them finish a shock sixth in their semi-final on Thursday.

The US team featured two of the individual 100m finalists, Fred Kerley and Ronnie Baker, the world leader Trayvon Bromell, and Cravon Gillespie, who also ran the heats en route to their 2019 world championship-winning team.

But despite the depth of talent on show, a shocking second changeover saw them lose all momentum and Gillespie was unable to run them back into contention in a mass finish, with China the surprise heat winners in 37.92.

Canada were second, two thousandths of a second behind, and Italy, helped by newly-crowned individual champion Lamont Marcell Jacobs, posted a national record 37.95 to also advance.

Jamaica led the way in the other semi, qualifying fastest in 37.82, ahead of Britain (38.02) and Japan (38.16)

After dominating the event for decades, a succession of disqualifications contributed to the United States not managing gold since 2000 and this is the latest setback in what has been a considerably below-par performance in Tokyo for the male side of the sport's traditionally most powerful nation.

Updated: August 5th 2021, 11:21 AM