 Nyorai kupfuurira kweiyi ndima - Merzario akaita Fomula One yake yekutanga muna 1972, uye akava mumwe wevatyairi vashoma kuti vawane mapoinzi pamakwikwi avo okutanga nokupedza vari panzvimbo yechitanhatu muBritish Grand PrixkuBrands Hatch. Muna 1973 Ferrari yakamusimbisa kwemwaka wose pamwe chete naJacky Ickx. Merzario akanga ane mavambo anovimbisa ne 312B2 yekare, achipedza chechina muBrazil neSouth Africa. Zvisinei, motokari yaFerrari yakashandurwa, 312B3, yakaratidza kuva inonyadzisa, uye vose vari vaviri iye naIckx vakarwa kwegore rose. Asingafadzwi zvikuru nenzira iyo mwaka wakanga wabuda nayo, Enzo Ferrari akasarudza kuchinja boka rose nokuda kwemwaka wa1974, uye Merzario akatamira kuWilliams. Pashure pokupedza wechitatu munhangemutange isiri yeChampionship muBrazil, Merzario akawana mapoinzi kuMonza uye muSouth Africa. Zvisinei, motokari dzaWilliams dzakanga dzisingakwikwidzi, uye muna 1975, mushure mekunge imwe-off neCopersucar kuMonza, kwaakapedza gumi nerimwe, Merzario akadzokera kumitambo yemotokari neAlfa Romeo kukunda makwikwi mana pamwe neTarga Florio zvakare. 