He made his senior debut in 1977 as an amateur (later to become semi-professional, and eventually fulltime-professional), and was an understudy to Danish national team goalkeeper Mogens Therkildsen, as OB won the 1977 Danish championship.
Lars von Trier | Lars Ulrich | MC Lars | Lars Forssell | Lars Danielsson | Lars Saabye Christensen | Lars Løkke Rasmussen | Lars Levi Laestadius | Lars Bystøl | Lars Onsager | Lars Winnerbäck | Lars Petrus | Lars-Olof Mattsson | Lars Norén | Lars Lindberg Christensen | Lars Lilholt | Lars Leksell | Lars Larson | Lars Knutzon | Lars Jonson Haukaness | Lars Hirschfeld | Lars Gullin | Lars Frölander | Lars Werner | Lars Tolumnius | Lars Schneider | Lars Porsena | Lars Olausson | Lars Oftedal Broch | Lars Nielsen |
Martin S. Jensen began his career with local amateur club Korup near Odense, before moving to nearby top-flight Superliga club Odense BK (OB) in 1996, where he served as an understudy to Danish international keeper Lars Høgh.