American Alexis Holmes and great Britain’s Matthew Hudson-Smith emerged as the winners of the women’s and men’s 400m races at the inaugural Jamaica Athletics Invitational at the National Stadium in Kingston on Saturday.

Holmes, a member of the USA’s gold medal-winning mixed relay team at the World Championships in Budapest last year and the World Relays this year in Nassau, ran 50.31 to lead an American 1-2-3 with Brittany Brown running 51.21 in second and Naasha Robinson running 51.81 in third.

“I had a lot of fun. The energy was great,” Holmes said after the race.

“I was expecting a smooth race and just trying to get the win. I just try to stay relaxed and poised because I know I have a strong finish,” she added.

The men’s race saw World Championship silver medallist Matthew Hudson-Smith produce 44.69 to take the win ahead of American Matthew Boling (44.98) and Jamaica’s Zandrion Barnes (45.41).

“I’m a lot more healthier this year. I’ve got the best team in the world. My coach Gary Evans is a man with a plan and this year it’s all about being healthy when it matters,” he said after the race.

“It was a good executed race. We just wanted to come home strong and be composed. I’ve got Oslo, Europeans, Monaco and London so I’ve got a lot more races and training,” he added.

The Brit also gave props to World Champion Antonio Watson who ran 45.61 for fifth.

“Listen, he’s the reigning World Champion so I’ve got to give him respect. He came out here in front of his people and raced. He delivered when it mattered,” he said.

Antonio Watson produced a spirited run to claim his maiden World title in the men’s 400m final at the IAAF World Athletics Championships in Budapest on Thursday.

The 21-year-old, who produced a massive personal best 44.14 in the semi-finals on Tuesday, ran a measured first 300m before producing a magnificent final 100m to blaze past Great Britain’s Matthew Hudson-Smith who was second in 44.31. American Quincy Hall ran a personal best 44.37 to take bronze.

2011 World Champion Kirani James ran 44.52 for fifth while Sean Bailey ran 44.96 for sixth.

Watson’s gold medal is the second in the World Championships by a Jamaican with the first coming 40 years ago when Bert Cameron took gold in Helsinki.

Sprinter Matthew Hudson-Smith says he endures daily injury pain but insists he will be ready for next month’s World Championships after leaving last weekend’s Diamond League meet in a wheelchair.

Great Britain’s squad for Budapest is due to be announced on Friday afternoon, with 400m runner Hudson-Smith seeking to better the bronze he won in Eugene last year.

The 28-year-old clocked a season’s best 44.72 seconds in finishing fourth in London on Sunday before raising concerns about his fitness by requiring mobility assistance at the end of the race.

He opted against revealing the specific location of an ongoing issue he termed as a “niggle” as he allayed fears about him being absent from the track in Hungary.

“I’m not at 100 per cent but I’ll be ready for the Worlds,” said Hudson-Smith.

“Listen, money is on the line, I’ve trained all year. I hope people understand how much work I have put into this year.

“I didn’t do all this work just to fall at the last hurdle. Whether I am good or bad, I’m gonna put my all in.

“At championships I always do my best and as you see when I get into finals I make medals. We’re loading for Worlds so we’ll be ready for when it matters.”

South Africa’s Wayde Van Niekerk clinched 400m glory at London Stadium in 44.36 secs.

American duo Bryce Deadmon and Vernon Norwood also crossed ahead of European champion Hudson-Smith.

“I couldn’t walk (after the race in London),” he said. “It was burning at the top bend so I had to push through.

“It aggravates on the bends and my event is two bends so it’s a matter of where it’s going to hurt.

“I’ve had an ongoing niggle since April. It’s been hard to manage. Sometimes it’s up, sometimes it’s down.”

Asked if he endures pain when lying in bed, he replied: “It’s every day, man, literally it’s bad. Christine (Ohuruogu, former 400m sprinter) has had similar issues as well and I’ve talked to her about it.

“I’ve got the best people in the world looking after me. It is just managing it and changing training so I’m fit and now we can put some speed into it and lean into it.”