A healthcare worker administers the Pfizer/BioNTech coronavirus disease (COVID-19) vaccine, which was authorized by Canada to be used for children aged 12 to 15, at Woodbine Racetrack pop-up vaccine clinic in Toronto, Ontario, Canada May 5, 2021. REUTERS/Carlos Osorio

A healthcare worker administers the Pfizer/BioNTech coronavirus disease (COVID-19) vaccine, which was authorized by Canada to be used for children aged 12 to 15, at Woodbine Racetrack pop-up vaccine clinic in Toronto, Ontario, Canada May 5, 2021. REUTERS/Carlos Osorio

People wait in line to be vaccinated with the Pfizer/BioNTech coronavirus disease (COVID-19) vaccine, which was authorized by Canada to be used for children aged 12 to 15, at Woodbine Racetrack pop-up vaccine clinic in Toronto, Ontario, Canada May 5, 2021. REUTERS/Carlos Osorio

People wait the required 15 minutes after receiving the Pfizer/BioNTech coronavirus disease (COVID-19) vaccine, which was authorized by Canada to be used for children aged 12 to 15, at Woodbine Racetrack pop-up vaccine clinic in Toronto, Ontario, Canada May 5, 2021. REUTERS/Carlos Osorio

A healthcare worker prepares a dose of the Pfizer/BioNTech coronavirus disease (COVID-19) vaccine, which was authorized by Canada to be used for children aged 12 to 15, at Woodbine Racetrack pop-up vaccine clinic in Toronto, Ontario, Canada May 5, 2021. REUTERS/Carlos Osorio

Pfizer/BioNTech coronavirus disease (COVID-19) vaccines, which were authorized by Canada to be used for children aged 12 to 15, are seen at Woodbine Racetrack pop-up vaccine clinic in Toronto, Ontario, Canada May 5, 2021. REUTERS/Carlos Osorio

Healthcare workers prepare doses of the Pfizer/BioNTech coronavirus disease (COVID-19) vaccine, which was authorized by Canada to be used for children aged 12 to 15, at Woodbine Racetrack pop-up vaccine clinic in Toronto, Ontario, Canada May 5, 2021. REUTERS/Carlos Osorio

Vials of the Pfizer/BioNTech coronavirus disease (COVID-19) vaccine, which was authorized by Canada to be used for children aged 12 to 15, are seen at Woodbine Racetrack pop-up vaccine clinic in Toronto, Ontario, Canada May 5, 2021. REUTERS/Carlos Osorio

A healthcare worker prepares a dose of the Pfizer/BioNTech coronavirus disease (COVID-19) vaccine, which was authorized by Canada to be used for children aged 12 to 15, at Woodbine Racetrack pop-up vaccine clinic in Toronto, Ontario, Canada May 5, 2021. REUTERS/Carlos Osorio

A jokey rides his horse out to the racetrack on the day of the 147th Kentucky Derby at Churchill Downs in Louisville, Kentucky, U.S. May 1, 2021. REUTERS/Amira Karaoud

Churchill Downs' workers strike at the entrance to the racetrack in the 147th Oaks race, a day before Kentucky Derby in Louisville, Kentucky, U.S. April 30, 2021. REUTERS/Amira Karaoud

Danielle, a rider, rides a horse at Churchill Downs racetrack on Thurby morning, the official start of the 147th Kentucky Derby Week, in Louisville, Kentucky, U.S. April 29, 2021. REUTERS/Amira Karaoud

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey David Egan is presented with the trophy after winning the Saudi Cup riding Mishriff alongside Abdulrahman bin Abdullah Al-Faisal and his children REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey David Egan celebrates with the trophy after winning the Saudi Cup riding Mishriff REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey David Egan celebrates with the trophy after winning the Saudi Cup riding Mishriff REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Spectators at the racetrack take a selfie REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey William Buick celebrates after winning the Saudi Arabian Airlines Riyadh Dirt Sprint riding Copano Kicking REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey William Buick celebrates after winning the Saudi Arabian Airlines Riyadh Dirt Sprint riding Copano Kicking REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Mishriff ridden by David Egan and Charlatan ridden by Mike Smith in action during The Saudi Cup REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey David Egan celebrates winning the Saudi Cup riding Mishriff REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey David Egan celebrates winning the Saudi Cup riding Mishriff REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey David Egan celebrates winning the Saudi Cup riding Mishriff REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey David Egan celebrates winning the Saudi Cup riding Mishriff REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey David Egan celebrates winning the Saudi Cup riding Mishriff REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Saudi Arabia Crown Prince Mohammed bin Salman during the trophy presentation for The Saudi Cup REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey David Egan celebrates with the trophy after winning the Saudi Cup riding Mishriff REUTERS/Ahmed Yosri TPX IMAGES OF THE DAY

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey David Egan celebrates with the trophy after winning the Saudi Cup riding Mishriff REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey David Egan celebrates with the trophy after winning the Saudi Cup riding Mishriff REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Saudi Arabia Crown Prince Mohammed bin Salman after The Saudi Cup REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey David Egan celebrates winning the Saudi Cup riding Mishriff REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Saudi Arabia Crown Prince Mohammed bin Salman after The Saudi Cup REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Mishriff ridden by David Egan and Charlatan ridden by Mike Smith in action during The Saudi Cup REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Jockey William Buick celebrates with a trophy after winning the Saudi Arabian Airlines Riyadh Dirt Sprint riding Copano Kicking REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Saudi Arabia Crown Prince Mohammed bin Salman before the Saudi Cup REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Saudi Arabia Crown Prince Mohammed bin Salman before the Saudi Cup REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Hollie Doyle (R) celebrates with a trophy after winning The Neom Turf Cup riding True Self REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Trainer Charlie Appleby and jockey William Buick celebrate with trophies after Space Blues wins the stc 1351 Turf Spring REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Trainer Fahd Saad, owner Prince Faisal bin Khalid and jockey Wigberto Ramos celebrate after Albathaly wins the Jockey Club Local Handicap REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Trainer Saeed bin Suroor celebrates with a trophy after Gifts Of Gold ridden by Pat Cosgrave wins the Red Sea Turf Handicap REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Keita Tosaki celebrates winning The Al Rajhi Bank Saudi Derby riding Pink Kamehameha REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Keita Tosaki celebrates winning The Al Rajhi Bank Saudi Derby riding Pink Kamehameha REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 General view during The Al Rajhi Bank Saudi Derby REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Keita Tosaki celebrates winning The Al Rajhi Bank Saudi Derby riding Pink Kamehameha REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Keita Tosaki celebrates winning The Al Rajhi Bank Saudi Derby riding Pink Kamehameha REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Pink Kamehameha ridden by Keita Tosaki in action before winning The Al Rajhi Bank Saudi Derby REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Pink Kamehameha ridden by Keita Tosaki in action before winning The Al Rajhi Bank Saudi Derby REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Pink Kamehameha ridden by Keita Tosaki during The Al Rajhi Bank Saudi Derby REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Round Six ridden by Naif Alanazi during The Al Rajhi Bank Saudi Derby REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Cowan ridden by Joel Rosario during The Al Rajhi Bank Saudi Derby REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Adel Alfouraidi celebrates winning the Obaiya Arabian Classic riding Mubasher Alkalediah REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Adel Alfouraidi celebrates with a trophy after winning the Obaiya Arabian Classic riding Mubasher Alkalediah REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Spectators take pictures on their mobile phones at the racetrack REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Wigberto Ramos celebrates with a trophy after winning the Jockey Club Local Handicap riding Albathaly REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Wigberto Ramos celebrates winning the Jockey Club Local Handicap riding Albathaly REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Wigberto Ramos celebrates winning the Jockey Club Local Handicap riding Albathaly REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 For The Top ridden by Mickael Barzalona in action during The Neom Turf Cup REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Channel Maker ridden by Joel Rosario leads during The Neom Turf Cup REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Pat Cosgrave is presented with a trophy after winning the Red Sea Turf Handicap riding Gifts Of Gold REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 Call The Wind ridden by Olivier Peslier in action during the Red Sea Turf Handicap REUTERS/Ahmed Yosri

Horse racing - Saudi Cup - King Abdulaziz Racetrack, Riyadh, Saudi Arabia - February 20, 2021 General view of competitors before the Red Sea Turf Handicap REUTERS/Ahmed Yosri