Question: Which basketball player had his jersey retired by both the Baltimore Bullets and New York Knicks, and averaged a team high 20.7 points for his team during the 1975-76 NBA season?
Sentence (from "1975–76 New York Knicks season"): Spencer Haywood led New York in rebounding with 11.3 per game, and Walt Frazier averaged a team-best 5.9 assists per game.
Relevant evidence: No