Carlos Beltrán is a Puerto Rican professional baseball outfielder for the St. Louis Cardinals of Major League Baseball (MLB). He has also played in MLB for the Kansas City Royals, Houston Astros, New York Mets, and San Francisco Giants.

Beltrán was the American League Rookie of the Year in 1999. He has been named to seven MLB All-Star Games, and has won three Gold Glove Awards and two Silver Slugger Awards. Beltrán is a member of the 30–30 club, as he has hit 30 home runs and stolen 30 bases in the same season.

Beltrán is among the best all-time statistical hitters in Major League Baseball postseason games, which has earned him nicknames such as "the new Mr. October", "Mr. October, Jr.", "Señor Octubre" and "the real Mr. October" from the media.

He leads several offensive categories during this month, including slugging percentage, runs scored in a single season and at bats per home run-ratio. Beltrán is MLB's all-time leader in OPS (on-base plus slugging) during the postseason, surpassing Babe Ruth and Lou Gehrig among players with at least a hundred at-bats. He has broken the 1.000 OPS mark in four different playoff series. Beltrán also has a 100% stolen base percentage during this phase of the tournament, which are the most stolen bases without being caught.