What was the name of the championship series Robert Seguso and Vasek Pospisil  were involved with?
Robert Seguso Robert Arthur Seguso (born May 1, 1963) is a former professional tennis player from the United States. A doubles specialist, he won four Grand Slam men's doubles titles (two Wimbledon, one French Open and one US Open). He also won the men's doubles Gold Medal at the 1988 Olympic Games in Seoul, partnering Ken Flach. Seguso reached the World No. 1 doubles ranking in 1985. He won a total of 29 career doubles titles between 1984 and 1991.
Champions Series (senior men's tennis tour) Since 2006, the Champions Series is a series of tennis tournaments designed for former champion members of the ATP Tour. The Champions Series consists of tournaments played in select markets where top players of the sport compete in one-night, four-player events with two one-set semifinal matches and a one-set championship match played in one evening.