As their floor general and top perimeter defender, he led the New York Knicks to the franchise's only two championships (1970 and 1973), and was inducted into the Naismith Memorial Basketball Hall of Fame in 1987.

Upon his retirement from basketball, Frazier went into broadcasting; he is currently a color commentator for telecasts of Knicks games on the MSG Network.

[1] In October 2021, Frazier was again honored as one of the league's greatest players of all time by being named to the NBA 75th Anniversary Team.

He learned basketball on a rutted and dirt playground, the only facility available at his all-black school in the racially segregated South of the 1950s.

As a sophomore in 1965, Frazier led SIU to the NCAA Division II Tournament, only to lose in the finals to Jerry Sloan and the Evansville Purple Aces 85–82 in overtime.

SIU and Frazier won the National Invitation Tournament, defeating Marquette University, 71–56, in the final, in the last college basketball game played at the old Madison Square Garden in New York.

The Knicks made it to the 1970 NBA Finals thanks to the great play of both Frazier and star teammate Willis Reed.

[8]The Knicks were unable to repeat as champions in 1971, falling to the Baltimore Bullets and their star shooting guard Earl Monroe in the second round of the playoffs despite Frazier's 20.4 points per game average during the series.

During the off-season, in May 1971, Frazier scored 26 points and was named MVP of an exhibition game played between NBA and ABA All-Stars in Houston's Astrodome.

The website Clyde So Fly[15] catalogs and grades every suit he wears while broadcasting New York Knicks games on the MSG Network.

His phrase "posting and toasting" — a description of player moving close to the basket and scoring over a rival — inspired the name of the popular Knicks blog, postingandtoasting.com.