Guillermo Gracida Jr., a.k.a. "Memo Gracida", (born July 25, 1956) is a Mexican polo player whose international career includes several record-setting achievements, including the most U.S. Open victories (16) and the most consecutive years as an American 10-goaler (21). These feats and dozens of major tournament wins led to Gracida's selection as Player of the Centennial Era in 1990 and his induction into the National Polo Hall of Fame in 1997 while still an active player.