Nyora kupfuurira kweiyi ndima - Lehmann akatambira AIK muSweden Elitserien kwemwaka mishanu kubva 1982 kusvika 1987. Akasarudzwa neBoston Bruins yeNational Hockey League muna 1982 NHL Entry Draft
, akabatana neBoston mumwaka wa1987/88, uye akatamba mitambo mipfumbamwe mwaka iwoyo, uye mimwe mitambo makumi maviri nematanhatu mwaka unotevera, achipedza mazhinji emakore maviri iwayo achitamba neBruins 'American Hockey League mubatanidzwa Maine Mariners. Akatengeswa kuEdmonton Oilers pamberi pemwaka wa1989-90, asi akatamba mumutambo mumwe chete wekirabhu. Lehmann akatamba mumitambo 19 yemwaka wenguva dzose nemitambo mitanhatu yemitambo yeCape Breton Oilers asati adzokera kuSweden. Lehmann akatamba mamwe makore manomwe muElitserien, kunyanya kuAIK, asiwo kuMDO kwemwaka mumwe, uye mutambo mumwe weSödertälje mumwaka wake wekupedzisira, asati aenda pamudyandigere muna 1997.