"[2][clarification needed] Besides the two Bermuda Bowls, his other victories are the Rosenblum Cup, Transnational Open Teams, Senior Bowl, numerous North American Bridge Championships, and two wins in the London Sunday Times and Cavendish Invitational Pairs.
[4] Two years later, Sontag returned to London and won the tournament again, this time with Peter Weichsel,[4] with whom he formed one of the strongest partnerships in the world from the 1970s until 2005.
[3] The two were partners in the 1983 Bermuda Bowl tournament in Stockholm, when the United States defeated Italy in one of its most exciting final matches.
[4] Sontag returned to the final in 2001, in Paris, where team captain Rose Meltzer became the first woman to win the Bermuda Bowl.
[4] Meltzer teams including Sontag won the odd-years Senior Bowl in 2005 and 2007 and the open Rosenblum Cup in 2006.