The 58th Ostrava Golden Spike meeting, an IAAF World Challenge event, went down on Thursday in the Czech Republic, with Olympic champion Shaunae Miller-Uibo running a world best and silver medalist Andre De Grasse announcing his return to the top of the sport.

Here were the highlights in Ostrava:

Shaunae Miller-Uibo Smashes 300m World Best With 34.41

A spectacular start to her 2019 season continued for 400m Olympic champion Shaunae Miller-Uibo, who ran a 300m world best of 34.41 on Thursday in Ostrava. The time demolished the previous record in the rarely-run distance—35.30 set by Mexico’s Ana Guevara in 2003— by a whopping .89 seconds.

The event is not officially recognized by the IAAF, so it goes down as a world best as opposed to a world record.

58th Ostrava Golden Spike. Women's 300m.
1. Shaunae Miller-Uibo ?? 34.41 WR
2. Brittany Brown ?? 35.91 PB
3. Jaide Stepter ??36.12 PB
4. Anna Kielbasinska ?? 36.34 PB
5. Kyra Jefferson ?? 36.49 PB
6. Justyna Swiety-Ersetic ?? 36.50 PB#IAAF #WorldChallenge @JustSportsTweet pic.twitter.com/CqIkgK9b0o

— Miska (@M1ZKA) June 20, 2019

To put the 25-year-old Bahamian sprinter’s time in perspective, her 200m split was clocked at 22.44, which by itself would be a top seven mark in the world this season. The performance in the Czech Republic was yet another shockingly fast early-season result for Miller-Uibo, whose 49.05 400m opener in April stands as the top clocking in 2019 by over a second.

Andre De Grasse Is Back: Canadian Beats Christian Coleman With 19.91 200m

Not since the 2016 Rio Olympics had 24-year-old Andre De Grasse run a wind-legal 200m under 20 seconds, but that all changed on Thursday at the rainy Ostrava Golden Spike event as the Canadian beat 100m world leader Christian Coleman 19.91 to 19.97 in the Czech Republic. The Olympic silver medalist has dealt with a series of hamstring injuries over the last few years, and his result in Ostrava is the clearest sign yet that De Grasse is nearing top form again.

De Grasse unsurprisingly trailed Coleman-- himself running his first 200m in nearly two years-- early in the race as the world’s best starter blasted out of the blocks. But the Canadian rallied coming off the curve and caught the 60m world record holder in the final 20 meters.

58th Ostrava Golden Spike. Men's 200m. Wind -0.6
1. Andre De Grasse ?? 19.91 SB
2. Christian Coleman ?? 19.97 SB
3. Clarence Munyai ?? 20.31 SB
4. Pavel Maslak ?? 20.62 SB
5. Brendon Rodney ?? 20.65#IAAF #WorldChallenge @JustSportsTweet pic.twitter.com/VAP9jVAAlw

— Miska (@M1ZKA) June 20, 2019

The 200m completed an impressive double for De Grasse on Thursday. Earlier in the meet he was second in the 100m in a 10.05 season's best.

Despite the loss, the result has to be encouraging for Coleman. 19.97 is the second-best time of his life and just his third ever sub-20 clocking. The 23-year-old has said that he plans to double at the World Championships, and a 19.97 opener is a positive step in that direction.

Mariya Lasitskene Matches 2.06m High Jump PB, Takes Three Cracks At World Record

Authorized neutral athlete and Russian Mariya Lasitskene continued her dominant run in the women’s high jump with a 2.06m clearance in Ostrava, tying her personal best from 2017. The mark improves on Lasitskene's 2019 world lead and is tied for fifth-best in world history.

Clears 2.06m without touching bar ✅
Highest jump since July 2017 ✅
Equals PB ✅
Wins by 8cm ✅

Mariya Lasitskene is still the high jump ?queen? pic.twitter.com/8ClNwCpt1u

— SPIKES (@spikesmag) June 20, 2019

The winner of the last two world titles, Lasitskene has lost just one outdoor competition in the last three seasons. The 26-year-old took three unsuccessful cracks at a 2.10 world record to end her day. 

Steven Gardiner Wins Men’s 400m As Kenny B Can Only Manage 47.02

It was a successful 400m opener for 23-year-old Steven Gardiner of the Bahamas, who won the Ostrava 400m going away in 44.95. Bahrain’s Abbas Abubaker was a distant second in 45.86. Gardiner is the reigning World silver medalist.

Elsewhere in the race, it was a second straight tough outing for American Kenny Bednarek, who was sixth in a disappointing 47.02. The 20-year-old junior college sprinter, who owns a 44.73 personal best, got out aggressively through the opening 200m but faded hard in the final straightaway.

Bednarek electrified the track community with a 19.82/44.73 one day double on May 16, but since has managed just a 20.51 200m on June 16 to go along with today’s result.