Nieves, 50, joined the Red Sox organization as major league pitching coach on November 7, 2012. In 2013, his first year as a major league pitching coach, he oversaw the pitching staff that helped Boston win its eighth World Series championship. That year, the staff posted a 3.79 ERA, the lowest mark for the club since 2002 (3.75 ERA). Boston's pitchers also set a single-season franchise record with 1,294 strikeouts in 2013.
Prior to joining the Red Sox, Nieves spent 14 years coaching in the Chicago White Sox organization (1999-2012), including the final five years as bullpen coach (2008-12) for the big league club. His coaching career began with a five-year stint in the New York Yankees organization from 1992-96.
As a player, Nieves spent three seasons in the majors with the Milwaukee Brewers (1986-88), going 32-25 with a 4.71 ERA and 352 strikeouts in 94 games (81 starts). The left-hander became the first pitcher in Brewers history and the first native of Puerto Rico to throw a no-hitter when he did so against the Baltimore Orioles on April 15, 1987 at the age of 22.