The Mauritania-born transferred allegiance athlete, who set an Asian record of 47.47 seconds in beating his fellow 22-year-old at last week's International Association of Athletics Federations Diamond League meeting in Rome, proved too smooth and powerful again as the series moved on to Oslo, winning in a meeting record of 47.60.

Samba's fellow 22-year-old, who lowered his Norwegian record to 47.82 in finishing second in his season-opener last week, took the same place again in 48.22, with American Olympic champion Kerron Clement a distant fifth in 49.30.

Warholm, whose time matched what he set in winning the world title in London last year, said: "This is the second best time of my career and I'm happy with my race today.

"It's great to run here, but I wasn't as fast here as I was in Rome so I'm looking forward to sitting down with my coach to see where I can improve before running in the next Diamond League meeting in Stockholm on Sunday."

Samba, who will also run in Stockholm, said: "The difference between Rome and today was that it was a little bit windy.

"I'm enjoying life and hoping to run even faster in Stockholm - maybe even close to 47 seconds."

The concluding event of the Dream Mile was won by the favourite, world 1,500m champion Elijah Manangoi.

The race had been paced with a 3min 46sec target but it became a slower, more tactical affair before the Kenyan moved clear to win in 3:56.95sec after taking the initiative early in the final lap.

Bahrain's Sadik Mikhou was second in 3:57.10 and Ethiopia's Taresa Tola clocked 3:57.92 to deprive another local runner, reigning European 1,500m champion Filip Ingebrigtsen, a podium place by 0.05sec.

Earlier in the evening, in a race outside the Diamond League scoring, Ingebrigtsen's remarkable 17-year-old brother Jakub had lowered his 1,500m best to 3:36.05 in taking third place behind Britain's Chris O'Hare, winner in 3:35.96, and Robby Andrews of the US who clocked 3:36.05.

New Zealand's world champion Tomas Walsh saw his US rival, Olympic champion Ryan Crouser, and raised him in a humungous shot put competition.

When Crouser stuck the shot out to 22.21m in the fifth and penultimate round, as he admitted afterwards, he thought he had the win in the bag.

Walsh disabused him of that idea by producing a final round effort of 22.29, and when the American saw the red flag go up for his almighty last throw, the points were settled.

"It's unusual to throw over 22 metres and not win," said Crouser.

"I fouled the last one maybe by a centimetre - it was a tough one to see the red flag go up, because that one was close to 23."

Turkey's world 200m champion Ramil Guliyev won in a season's best of 19.90 from Aaron Brown of Canada, who ran a personal best of 19.98 to finish one place ahead of Trinidad and Tobago's world bronze medallist Jereem Richards, who clocked 20.19, with Britain's Adam Gemili fourth in a season's best of 20.21.

In the women's 400m, world champion Phyllis Francis of the US was beaten by Bahrain's Salwa Aid Naser, who clocked 49.98 to the American's 50.47.

Like the men's shot put, the women's javelin was also decided in the final round as Tatsiana Khaladovich of Belarus overhauled the first round lead of 65.11m set by China's 2017 world bronze medallist Huihui Lyy with a national record of 67.47m.

The Ivory's Coast's world indoor champion Murielle Ahoure won the women's 100m in 10.91, with Britain's Dinah Asher-Smith lowering her own national record of 10.99 to 10.92 in second place.

Asher-Smith's compatriot Laura Muir was not so successful in a women's 800m won, unsurprisingly, by South Africa's world and Olympic champion Caster Semenya in 1min 57.25sec from Burundi's Francine Niyonsaba, who clocked 1:58.57.

Muir, fifth in 1:59.09, said: "I hoped to run 1.58, but the pace slowed on the second lap."

Emma Coburn, the world 3,000m steeplechase champion, suffered another defeat by her predecessor as world champion, Hyvin Kiyeng - but the American, who fell at the final water jump in Rome while contesting the lead with Kiyeng and fellow Kenyan Celliphine Chespol, is getting closer.

Kiyeng crossed first in 9min 9.63sec, but Coburn was only 0.07sec behind her, with the nearest opposition more than seven seconds adrift.

All the more credit to Coburn, too, as she had put herself out mid-race to signal that one of the barriers, which caused several runners to come to grief, had been set incorrectly at the height for men's steeplechasing.

A clearance of 2.36m was enough for Qatar's world high jump champion Mutaz Essa Barshim to earn victory over the Russian athlete who beat him to the world indoor title earlier this year, Danil Lysenko, who had a best of 2.33.

Katerina Stefanidi's unprofitable season continues - the world and Olympic pole vault champion failed to register a mark, failing three times at 4.41m, in a competition won by Sandi Morris of the US with 4.81.