 Nyora kupfuurira kweiyi ndima - Hamrin akatanga kutamba kuAIK muSweden, iyo yaakabatana nayo mumwaka wa195253. Akazobatana neItaly Juventus mu1956 uye akatamba mitambo 23 mumwaka wake mumwe chete ikoko, achiisa zvibodzwa zvisere. Pashure pemwaka iwoyo mumwe chete, akabatana nePadova pachikwereti, uko akawana 20 vavariro mumitambo 30. Akangogara ikoko kwemwaka mumwe chete zvakare, zvisinei, sezvo akatengeswa kuFiorentina muna 1958, kwaakagara kusvika muna 1967, achitamba mitambo 289 Serie A uye achiwana zvibodzwa 150. Paaive kuFiorentina, akahwina Coppa Italia muna 1961 na1966, pamwe ne1960-61 European Cup Winners Cup achipedzisa makwikwi semutambi wepamusoro aine zvibodzwa zvitanhatu, kusanganisira chimwe mumutambo wechipiri wekupedzisira, kukunda 2-1 kumba pamusoro peRangers, uye 1966 Mitropa Cup. Hamrin anowanzoonekwa semumwe wevatambi veFiorentina vepamusoro, uye ndiye muchengeti wezvikwata zvepamusoro-soro, aine zvibodzwa makumi maviri nesere. Akabatana ne AC Milan muna 1967 uye akatamba ikoko kwemwaka miviri, achikunda mukombe weligi muna 1968; akahwinawo zvibodzwa zviviri zveMilan sezvo vakakunda Hamburg 20 mu1968 European Cup Winners Cup Final. Mwaka wakatevera, chikwata chacho chakakunda European Cup. Kirabhu yake yekupedzisira yeItaly yaive Napoli, iyo yaakabatana nayo kubva kuMilan muna 1969. Muna 1971, akadzokera kuSweden, achitamba mwaka mumwe weIFK Stockholm asati aenda pamudyandigere muna 1972. 