Isiah Young steals the show from Noah Lyles at 100m as Wayde van Niekerk pulls up in Boston

Isiah Young stunned Noah Lyles in the 100m at the track and field athletics Boost Boston Games meet on Sunday 23 May.

Several of the fastest people on the planet took the show on the road at the temporary track erected at the Boston Marathon finish line on Boylston Street, and they didn't disappoint, with Grant Holloway, Kendra Harrison, and Shaunae Miller-Uibo all recording impressive wins.

There was plenty of excitement despite the lack of spectators due to the ongoing COVID-19 pandemic.

A little too much excitement for South African fans whose hearts skipped a beat in the men's 200m as sprinter Wayde van Niekerk pulled up and limped out of his 200m race.

Thankfully for them, reports coming out of his camp say it was precautionary after he felt some slight hip discomfort.

With the U.S. Olympic track trials around the corner from June 18-27, the preparations are ramping up for Team USA hopefuls with the clock ticking down to the Tokyo 2020 Olympics in summer 2021.

Isaiah Young steals the show from Noah Lyles

One of Team USA's big hopes at Tokyo is Noah Lyles over 200m and 100m, but it was Isiah Young who grabbed the headlines in Boston with a 9.94s 100m to beat Lyles and win the final.

It was Young's second fastest time ever.

“I have complete faith that I’m going to be ready when the time comes,” said Lyles after the race, he expects to race again before Trials in Eugene, Oregon. The 23-year-old is targeting the 100m and 200m events in Japan this summer.

Find out more about Lyles in the Olympics.com series Athletes to Watch, which profiles the athletes set to light up the Tokyo Olympics in 2021, you can stream his episode below.

Grant Holloway stays perfect

Anyone who tries to tell you that nothing is perfect in life hasn't been watching Grant Holloway this season.

The American hurdler continued a hot streak of form clocking 13.20 to win the 110m event in his typically composed style.

It was a head-to-head race between the world indoor record-holder and the outdoor world record-holder as Holloway faced 35-year-old London 2012 gold medallist Aries Merritt.

It was Holloway's fourth win of four in the outdoor season following a perfect 10/10 indoors, and he just makes it look so easy.

As other racers clattered into hurdles sending them flying all around him in Boston, Holloway just held course, as smooth and clean as ever.

In his three previous wins this year outdoors, Holloway recorded 13.04 (+2.2 wind), 13.07, and 13.22 (-2.0 wind) times.

In February of this year the 23-year-old ran a 7.29s 60 metre world record in Madrid and looks unstoppable with the Olympics fast approaching.

Holloway was full of praise for Merritt afterwards, the two had a long hug after the race and asked what it meant Holloway said:

"It meant a lot, he's one of my mentors that I try model myself over, Aries is like an older brother to me so, it feels good to always have him next to me but at the end of the day I'm trying to have what he has."

He signed off with a warning: "You can keep doubting me, I'm just going to keep proving you wrong."

The question is, who's still doubting Grant Holloway?

Check out his episode of Athletes to watch at the Tokyo Olympics below.

Kendra Harrison cleans up women's 100m hurdles

World 100m hurdles record holder Kendra 'Keni' Harrison went 12.49 seconds to win comfortably despite a stacked field featuring Sharika Nelvis, who won here in Boston in 2018 and 2019, world indoor silver medallist Christina Clemons, 2015 world champion Danielle Williams of Jamaica, and African champion Tobi Amusan of Nigeria.

Harrison missed out on the Rio 2016 Olympics after a disappointing performance at the U.S. trials and that still drives her on as the trials roll around again before Tokyo.

"I think I came out here and got the job done," Harrison said afterwards, my coach wanted me to come out here and execute and of course... Just win."

The 28-year-old looks zoned in on her Olympic goals.

Van Niekerk pulls up in Boston

When it seemed like Wayde Van Niekerk had finally shaken off that injury he picked up playing rugby in 2018, setting his season best at 20.38 when when he won the South African 200m title in April, he's pulled out of a race once more.

Van Niekerk pulled up around 15 metres from the finish line and limped to a stop on the straight track, but it doesn't appear to be too serious according to his team.

With Van Niekerk out Jerome Blake won the race clocking a 19.89 personal best, with European 100m champion Zharnel Hughes finishing second running 19.93 - also a personal best.

We were supposed to see the 400m reigning Olympic champ Van Niekerk race the 400m reigning world champion Steven Gardiner, but Gardiner withdrew after a nasty fall at the USATF Open in Fort Worth earlier this week.

In the women's 200m, Shaunae Miller-Uibo flowed through the second 100m to clock 22:08 and win by a half a second ahead of the USA's Kortnei Johnson (22.40).

Ever the perfectionist, Miller-Uibo had a little shake of her head after the race, but said she's looking forward to the Tokyo Games.

"I'm really excited for it, training is going well, in the last few weeks we've been dealing with some minor injuries but we're getting through it and just taking everything one step at a time."