Glavni rival Jorgea Martina u borbi za titulu, Marco Bezzecchi zauzima pol poziciju na debitantskoj trci u Tajlandu.
Trening se vozi u idealnim uslovima. U prvih deset minuta treninga najbolje se pokazuje Sasaki, sa vremenom od 1:42.942. Iza njega su Martin, DiGiannantonio i Bulega. U petnaestom minutu svi vozači su otišli u garaže, jedino McPhee ostaje na pisti.
Pauza je trajala desetak minuta, prvu poziciju na kratko zauzima Bezzecchi, jer mu je istu preuzeo Bastianini. Osam minuta pre kraja treninga, Masaki i Bulega izbijaju na prva dva mesta.
Četiri minuta posle, svi vozači ponovo ulaze u svoje garaže, ali se vrlo brzo vraćaju na stazu, kako bi što bolje odvezli jedan brzi krug. Na kraju se najbolje pokazuje Bezzecchi, ispred Masie, Masakija i Arbolina. Bastianini pada u 12. krivini zajedno sa Chantrom, domaćim wild card vozačem. Martin nije mogao bolje od 13. pozicije, zbog obnove povrede leve ruke.
Rezultati:
| 1 | 12 | Marco BEZZECCHI | ITA | Redox PruestelGP | KTM | 225.8 | 1’42.235 | |
| 2 | 5 | Jaume MASIA | SPA | Bester Capital Dubai | KTM | 231.0 | 1’42.697 | 0.462 / 0.462 |
| 3 | 22 | Kazuki MASAKI | JPN | RBA BOE Skull Rider | KTM | 227.4 | 1’42.716 | 0.481 / 0.019 |
| 4 | 14 | Tony ARBOLINO | ITA | Marinelli Snipers Team | Honda | 229.2 | 1’42.720 | 0.485 / 0.004 |
| 5 | 23 | Niccolò ANTONELLI | ITA | SIC58 Squadra Corse | Honda | 233.1 | 1’42.776 | 0.541 / 0.056 |
| 6 | 40 | Darryn BINDER | RSA | Red Bull KTM Ajo | KTM | 229.4 | 1’42.799 | 0.564 / 0.023 |
| 7 | 8 | Nicolo BULEGA | ITA | SKY Racing Team VR46 | KTM | 229.4 | 1’42.815 | 0.580 / 0.016 |
| 8 | 33 | Enea BASTIANINI | ITA | Leopard Racing | Honda | 228.8 | 1’42.818 | 0.583 / 0.003 |
| 9 | 21 | Fabio DI GIANNANTONIO | ITA | Del Conca Gresini Moto3 | Honda | 226.7 | 1’42.831 | 0.596 / 0.013 |
| 10 | 48 | Lorenzo DALLA PORTA | ITA | Leopard Racing | Honda | 232.0 | 1’42.835 | 0.600 / 0.004 |
| 11 | 71 | Ayumu SASAKI | JPN | Petronas Sprinta Racing | Honda | 229.2 | 1’42.942 | 0.707 / 0.107 |
| 12 | 77 | Vicente PEREZ | SPA | Reale Avintia Academy 77 | KTM | 228.4 | 1’42.961 | 0.726 / 0.019 |
| 13 | 88 | Jorge MARTIN | SPA | Del Conca Gresini Moto3 | Honda | 226.9 | 1’43.042 | 0.807 / 0.081 |
| 14 | 24 | Tatsuki SUZUKI | JPN | SIC58 Squadra Corse | Honda | 230.6 | 1’43.058 | 0.823 / 0.016 |
| 15 | 9 | Apiwath WONGTHANANON | THA | VR46 Master Camp Team | KTM | 228.1 | 1’43.071 | 0.836 / 0.013 |
| 16 | 42 | Marcos RAMIREZ | SPA | Bester Capital Dubai | KTM | 231.4 | 1’43.114 | 0.879 / 0.043 |
| 17 | 75 | Albert ARENAS | SPA | Angel Nieto Team Moto3 | KTM | 227.7 | 1’43.131 | 0.896 / 0.017 |
| 18 | 65 | Philipp OETTL | GER | Sudmetal Schedl GP Racing | KTM | 230.6 | 1’43.133 | 0.898 / 0.002 |
| 19 | 17 | John MCPHEE | GBR | CIP – Green Power | KTM | 226.1 | 1’43.179 | 0.944 / 0.046 |
| 20 | 41 | Nakarin ATIRATPHUVAPAT | THA | Honda Team Asia | Honda | 229.4 | 1’43.365 | 1.130 / 0.186 |
| 21 | 7 | Adam NORRODIN | MAL | Petronas Sprinta Racing | Honda | 228.1 | 1’43.399 | 1.164 / 0.034 |
| 22 | 84 | Jakub KORNFEIL | CZE | Redox PruestelGP | KTM | 227.9 | 1’43.424 | 1.189 / 0.025 |
| 23 | 35 | Somkiat CHANTRA | THA | AP Honda Racing Thailand | Honda | 227.4 | 1’43.437 | 1.202 / 0.013 |
| 24 | 19 | Gabriel RODRIGO | ARG | RBA BOE Skull Rider | KTM | 232.1 | 1’43.445 | 1.210 / 0.008 |
| 25 | 10 | Dennis FOGGIA | ITA | SKY Racing Team VR46 | KTM | 227.2 | 1’43.723 | 1.488 / 0.278 |
| 26 | 27 | Kaito TOBA | JPN | Honda Team Asia | Honda | 229.7 | 1’43.738 | 1.503 / 0.015 |
| 27 | 81 | Stefano NEPA | ITA | CIP – Green Power | KTM | 225.7 | 1’43.929 | 1.694 / 0.191 |
| 28 | 16 | Andrea MIGNO | ITA | Angel Nieto Team Moto3 | KTM | 226.8 | 1’43.964 | 1.729 / 0.035 |
| 29 | 52 | Jeremy ALCOBA | SPA | Estrella Galicia 0,0 | Honda | 227.2 | 1’43.972 | 1.737 / 0.008 |
| 30 | 72 | Alonso LOPEZ | SPA | Estrella Galicia 0,0 | Honda | 225.6 | 1’44.767 | 2.532 / 0.795 |