He holds one of the best at-bat to strike out ratios in modern baseball history, having struck out once every twenty three at bats.

Millán was acquired along with George Stone by the New York Mets from the Braves for Gary Gentry and Danny Frisella on November 1, 1972.

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.

[4] 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.