The immense crowd of 200,000 proved almost uncontrollable and almost forced the cancellation of the race. They were crammed in front of the guard-rails, sat at the trackside and ran across the track itself. Despite impassioned appeals from Jackie Stewart and local hero Pedro Rodríguez they still remained troublesome.
From the start, Jacky Ickx led from Stewart and Clay Regazzoni, but dropped back with steering column trouble. Later, a collision with a dog which had escaped onto the track damaged Stewart's suspension and forced his retirement, leaving the Ferraris dominant in first and second. Jack Brabham retired from third place in his final Grand Prix when the engine blew on lap 53. The Ferraris romped home with Ickx leading Regazzoni and Denny Hulme claiming the third podium spot. The Italian cars had proved they were now good enough to compete with the Ford-engined cars, but the crowd's antics meant that for safety reasons the Mexican Grand Prix would be dropped from the 1971 calendar.
Note: Only the top five positions are included for both sets of standings. Only the best 6 results from the first 7 rounds and the best 5 results from the last 6 rounds counted towards the Championship. Numbers without parentheses are Championship points; numbers in parentheses are total points scored.