OnlyWinners enters the SBR Rating Guide at D11.16.2008OnlyWinners enters the SBR Rating Guide at D-. The sportsbook is operated by the Sportsbook.com Group, which uses the company name Jazette Enterprises Limited. Like all Sportsbook.com books, Onlywinners is located in Costa Rica and uses World Gaming Software. SBR is currently discussing outstanding claims with Sportsbook.com management. The Sportsbook.com Group has unjustly confiscated balances from many players over the past two years.