The golf competition at Simpson Thacher & Bartlett’s firm outing this summer could get a boost in quality if one of the firm’s clients decides to make a surprise visit to the practice tee.

A team of Simpson lawyers led by partners Roy L. Reardon and Joseph M. McLaughlin successfully represented the disabled professional golfer Casey Martin before the U.S. Court of Appeals for the Ninth Circuit, which in March affirmed a lower court ruling that forced the PGA Tour to allow Mr. Martin the use of a cart in competition.