ANTWERP, Belgium — Three spectators were kicked out of the Diamond Games tournament because they were betting on a match online from the stands.

They were seen betting on points in real time from their laptops during a first-round match Monday and asked to leave, organizers said Tuesday. No further action was taken.

The WTA Tour is taking a tough stance against gambling at tournaments, especially after betting scandals on the ATP tour have tarnished the sport.

The WTA Tour has said up to half a dozen players have been approached to throw matches but insists that no match outcomes have been affected by gambling so far.