Nyorai kuenderera mberi kweiyi ndima - Muna 1990, pamwe chete nevakwikwidzi vake veFormula Three Heinz-Harald Frentzen naKarl Wendlinger, akabatana nehurongwa hweMercedes hwevadiki mumakwikwi eWorld Sportscar Championship. Izvi zvakanga zvisina kujairika kumutyairi wechiduku: vazhinji vevanhu vakararama panguva yaSchumacher vakakwikwidza muFormula 3000 munzira yekuFormula One. Zvisinei, Weber akaudza Schumacher kuti kuratidzwa kumisangano yevashandi vepepanhau uye kutyaira motokari dzakasimba mumakwikwi marefu-refu zvaizobatsira basa rake. Mumwaka wa1990 weWorld Sportscar Championship, Schumacher akakunda mwaka wekupedzisira kuAutódromo Hermanos Rodríguez muSauber <unk> Mercedes C11, uye akapedza wechishanu muDrivers 'Championship kunyangwe achingotyaira mumakwikwi matatu kubva pamakwikwi mapfumbamwe. Akaenderera mberi nechikwata mumwaka wa1991 weWorld Sportscar Championship, achikunda zvakare mujaho wekupedzisira wemwaka kuAutopolis kuJapan neSauber <unk> Mercedes-Benz C291, zvichitungamira kunzvimbo yechipfumbamwe muDrivers 'Championship. Akakwikwidzawo muLe Mans mumwaka iwoyo
, vachipedza vari vashanu mumotokari yavakagoverana naWendlinger naFritz Kreutzpointner. Muna 1991, akakwikwidza mujaho mumwe chete muJapan Formula 3000 Championship, achipedza wechipiri.