Rothenberg, Ben. "Man Barred From Open Last Year Is Arrested After Returning", The New York Times, September 2, 2017. Accessed September 2, 2017. "The United States Tennis Association announced on Friday the arrest of an Estonian man who violated a no-trespassing order by returning to the United States Open after having been ejected from the tournament last year.... Piirimets was ejected from the Open last year for what is known as courtsiding, a term for collecting immediate data about the scores of tennis matches in person and then using the information to make wagers, either by placing bets directly or by transmitting the information to someone else.... Piirimets was one of 20 people (17 men and three women) caught courtsiding at the U.S. Open last year."
