Hans "Hanne" Nüsslein (German pronunciation: ['hans ˈnʏslaɪ̯n]; 31 March 1910 – 28 June 1991) was a German tennis player and coach and former World professional number 1 tennis player who won five professional Majors singles titles during his career.
Nüsslein was born in Nuremberg on 31 March 1910. In his youth, he played football, handball and tennis at the 1. FC Nürnberg. After finishing school he apprenticed as a mechanic. At age 16, he gave tennis lessons to other club members for which he was paid a small amount. After a member of a neighboring club reported this to the German Tennis Federation, Nüsslein received a lifetime ban from amateur competition, preventing him from competing at Grand Slam tournaments.
Nüsslein then decided to work as a professional tennis coach. On 1 April 1928, he passed the qualifying examination and became a member of the German federation of tennis coaches. He then was hired by the Deutsche Bank in order to give lessons to their executives.