Spanish police have made widespread arrests following an investigation into tennis match-fixing by an organised Armenian criminal gang.

Eleven house searches were carried out in Spain and 167,000 euros ($A268,620) in cash were seized, along with a shotgun, more than 50 electronic devices, credit cards, five luxury vehicles and documentation related to the case.

Forty-two bank accounts have been frozen.

Spanish police said in a statement 15 people had been arrested, including the leaders of the criminal organisation, while a further 68 people have been investigated.

Of the 83 people implicated in the case, 28 were professional tennis players including one, whose identity was not revealed, who competed at the 2018 US Open.

European Union law enforcement agency Europol, which supported the Spanish operation, said at least 97 matches from lower-tier Futures and Challenger tournaments were fixed.

News of the arrests came a day after the Tennis Integrity Unit (TIU) revealed that in 2018 more tennis players were disciplined for violations of anti-corruption rules than in any other year since the body’s creation.