Kammala wannan jumla: Sainz ya koma McLaren a wannan kakar, ya maye gurbin Fernando Alonso, wanda ya yi ritaya bayan kakar da kuma haɗin Lando Norris. Bayan rashin sa'a mara ma'ana a farkon kakar saboda matsalolin aminci a gasar tseren motoci ta duniya da kuma shiga cikin haɗuwa a gasar Bahrain da China, Sainz ya ci gaba da zira kwallaye daga baya, sau da yawa yana gamawa sosai a matsayin mafi kyawun sauran a bayan manyan ƙungiyoyi uku. Ya yi gwagwarmaya don matsayi na shida a gasar zakarun na direbobin tare da Pierre Gasly da Alexander Albon, waɗanda duka suka kwashe wani ɓangare na kakar a cikin Red Bull da sauri. A gasar, Sainz ya kasance na 4 da farko, bayan ya fara a 20th kuma na karshe bayan matsalar injin a cikin cancantar, amma ya hau zuwa na 3 bayan Lewis Hamilton ya sami hukunci saboda haddasa karo da Alexander Albon, wanda ya sami Sainz podium na farko a Formula One. Sainz ya kusan ninka maki da ya samu a kakar da ya yi fice a shekarar 2017. A cikin
Abu Dhabi Grand Prix Sainz ya sami damar wuce Hülkenberg a zagaye na karshe don ɗaukar matsayi na 10, inda ya sami maki wanda ya ba shi matsayi na 6 a gasar zakarun Turai a ƙarshen shekara.