The following players competed in Day 1 of the 2019 World Championships and acquired the 18 Match Points needed to advance to Day 2. The decks each player used on Day 1 are also listed.
- Miguel Aml (ES, 6-2-0)
- Mark Andersen (DE, 6-2-0) - Pikachu & Zekrom-GX
- Jason Annichiarico (US, 6-0-0) - Pikachu & Zekrom-GX
- Kaden Brent (US, 6-0-0) - Keldeo-GX Stall
- Kenny Britton (US, 5-0-3) - Pikachu & Zekrom-GX
- Louis Chi (NZ, 6-1-0)
- David Cooper (US, 6-1-1) - Pikachu & Zekrom-GX
- Zachary Cooper (US, 6-2-0) - Shedinja Control
- Bernardo Dias (PT, 5-0-3) - Malamar/Ultra Necrozma-GX
- Dalton Didelot (US, 5-0-3) - Malamar/Ultra Necrozma-GX
- Hampus Eriksson (SE, 6-0-0) - Beheeyem
- Victor Freitas (BR, 5-0-3) - Malamar/Giratina & Garchomp-GX
- Jose Carlos Gomez (PE, 6-1-0) - Malamar
- Dylan Gunn (US, 6-2-0) - Keldeo-GX Stall
- Mehdi Hafi (FR, 6-1-0) - Reshiram & Charizard-GX
- Blaine Hill (US, 6-2-0) - Reshiram & Charizard-GX
- Shunpei Hosoya (JP, 6-2-0)
- Riley Hulbert (US, 5-0-3) - Gardevoir & Sylveon-GX
- Dan Irish (US, 6-1-0) - Reshiram & Charizard-GX/Blacephalon-GX
- Will Jenkins (US, 6-2-0) - Pikachu & Zekrom-GX
- Konsta Kallama (FI, 6-1-0)
- Koki Kimura (JP, 6-1-1)
- Ryan Kingaby (ZA, 6-2-0)
- Ilya Kornilov (FI, 6-2-0) - Gardevoir & Sylveon-GX
- Zakary Krekeler (US, 6-1-1) - Dark Toolbox
- Tristan Lackey (US, 6-2-0)
- Jonathan Fabrizio Lanciano (AR, 6-2-0) - Blacephalon-GX/Naganadel
- Poet Larsen (US, 6-2-0) - Gardevoir & Sylveon-GX
- Charlie Lockyer (US, 6-2-0) - Pikachu & Zekrom-GX
- Koji Morimoto (JP, 6-2-0) - Gardevoir & Sylveon-GX
- Eri Nakamura (JP, 5-0-3) - Gardevoir & Sylveon-GX
- Dennis Peroff (CA, 5-0-3) - Malamar/Garchomp & Giratina-GX
- Danny Prather (US, 6-2-0) - Pikachu & Zekrom-GX
- Hideki Sano (JP, 6-2-0)
- Haruki Satoyama (JP, 6-1-0)
- Pacco Saurus (ES, 6-1-1)
- Michele Schiraldi (CA, 6-1-0)
- Luke Schmitt (AU, 6-1-0) - Pikachu & Zekrom-GX
- Eric Smith (US, 6-2-0) - Reshiram & Charizard-GX/Blacephalon-GX
- Simone Soldo (IT, 6-2-0)
- Marco Spataro (IT, 6-1-1)
- Tobias Thesing (DE, 6-1-0) - Fossil Toolbox
- Francisco Toranzo (ES, 5-0-3)
- Timothy Tsang (GB, 6-2-0)
- Jack Underwood (AU, 6-2-0) - Mewtwo & Mew-GX/Blastoise
- Aaron Van Der Kolk (AU, 6-2-0) - Pikachu & Zekrom-GX
- Sander Wojcik (NL, 6-1-0) - Rowlet & Alolan Exeggutor-GX/Lucario & Melmetal-GX Stall
- Shintaro Yamamoto (JP, 5-0-3)
- Takuya Yoneda (JP, 6-1-1) - Malamar/Garchomp & Giratina-GX
