Millán, nicknamed "The Kitten", born in Yabucoa, Puerto Rico, made his major league debut on June 2, 1966 with the Atlanta Braves, and played for Atlanta until 1973. Millan was primarily a second baseman. He played in two All-Star Games, the first in 1969 and the second in 1971; in 1970 he was named an All-Star, but was unable to participate due to injuries. In 1973, he was traded to the New York Mets, for which he played until 1977. In 1975 he became the first Met to appear in all 162 games during the season. He played for 12 years. His first game was June 2 1966 for the Atlanta Braves and his final game was August 12, 1977 for the New York Mets. Due to incurring a shoulder injury because of an incident in that August 1977 game, one against the Pittsburgh Pirates, Felix was forced to retire. The incident, an altercation with Pirate catcher Ed Ott, began with the latter sliding hard into second base attempting to break up a double play. Millán consequently shouted at Ott and hit him in the jaw with a baseball in his hand. Ott, a former wrestler, answered this by picking Millan up and slamming him into his extended knee at Three Rivers Stadium, severely injuring his shoulder, and unfortunately ending Felix's MLB career. On July 21, 1975, Joe Torre set a record for most double-plays grounded into in a single game, with Millán on first ahead of Torre. Millán had singled in all four of his at-bats. Torre said, "I'd like to thank Félix Millán for making all of this possible." Millán was a prototypical "slap" or "contact" hitter and his 1976 Topps baseball card, #245, shows his unusual batting stance, as he choked up almost halfway on the bat. Millán also played for three seasons in the Japanese Central League after leaving the majors. He joined the Yokohama Taiyo Whales in 1978, after the Whales bought his contract from the Mets, and played alongside Skip James. He won the batting title in his second year in Japan with a.346 batting average, and was given the Best Nine Award. He won the title with only 126 hits, barely having enough at-bats to qualify for the title. He did not play well the next year, and was released by the Whales after the 1980 season. In his three years in Japan, he had only 52 strikeouts in 1139 at-bats.