Law enforcement officials in Spain have arrested 28 professional tennis players in an investigation into match-fixing.
EU police agency Europol said the players were among 83 people detained by Spain's Civil Guard.
"The suspects bribed professional players to guarantee predetermined results and used the identities of thousands of citizens to bet on the pre-arranged games," Europol said.
At least 97 ITF Futures and Challenger matches were fixed, it said.
The arrests, which included one player who appeared at last year's US Open, follow an investigation into match-fixing by an organised Armenian criminal gang.
Europol said 11 house searches had been carried out in Spain in which 167,000 euros (£151,000) in cash were seized, along with a shotgun, more than 50 electronic devices, credit cards, five luxury vehicles and documentation related to the case.