[3] Neusel turned professional in 1930, racking up a 32–0–2 record before experiencing his first lost against Belgian pugilist Pierre Charles via points decision.

The venue was the dirt track facility in the immediate vicinity of Hagenbeck Zoo, which boxing promoter Walter Rothenburg had rebuilt within a few weeks in a rushed manner.

[6] Neusel lost the match via ninth round technical knockout, putting up a valiant effort but ultimately being outclassed by Schmeling.

[7] In 1935, Neusel returned to America to face former Heavyweight World Title holder Primo Carnera; losing the bout via fourth round knockout.

[7] He then returned to Europe and beat South African challenger Ben Foord twice, with both wins sandwiched around a loss to Tommy Farr.