2019 Mexican Grand Prix
The race was the 18th round of the 2019 Formula One World Championship and marked the 21st running of the Mexican Grand Prix , and the 20th time that the race had been run as a World Championship event since the inaugural season in . 
<triplet> 2019 Formula One World Championship <subj> 2019 <obj> point in time <subj> 21 <obj> number of matches played/races/starts