Juan Manuel Nieves Cruz (born January 5, 1965 in Las Lomas, Puerto Rico) is a former pitcher in Major League Baseball who, on April 15, 1987 against the Baltimore Orioles, became the second-youngest player in major league history to throw a no-hitter, and so far the only Milwaukee Brewer to do so. 
He was signed by the Brewers after graduating from Avon Old Farms school in Connecticut. After playing for the Milwaukee Brewers from 1986 to 1988, he suffered a career-ending arm injury. He is currently the bullpen coach for the Chicago White Sox.
Nieves' no-hitter became the first ever thrown by a Puerto Rican in Major League Baseball. The feat was credited to Nieves, though was made possible by amazing outfield grabs by Jim Paciorek and finally by Robin Yount with 2 outs in the 9th inning. He was at the time, the second youngest to ever throw a no-hitter.