Ronald William Hassey is an American former professional baseball player. He played in Major League Baseball (MLB) as a catcher for the Cleveland Indians (1978–1984), Chicago Cubs (1984), New York Yankees (1985–1986), Chicago White Sox (1986–1987), Oakland Athletics (1988–1990), and Montreal Expos (1991). Hassey is notable for being the only catcher in MLB history to have caught more than one perfect game. Hassey joined Gus Triandos as the only catchers in MLB history to have caught a no-hitter in both leagues.

The Montreal Expos were a Canadian professional baseball team based in Montreal. The Expos were the first Major League Baseball (MLB) franchise located outside the United States. They played in the National League (NL) East division from 1969 until 2004. Following the 2004 season, the franchise relocated to Washington, D.C., and became the Washington Nationals.