with the Milwaukee Braves, Conley returned to the Celtics for the 1958–59 season, again seeing limited usage at about 13 minutes a game for a team that swept the Minneapolis Lakers 4–0 in the NBA finals. Conley averaged 4.2 points and 5.4 rebounds during the regular season and 4.9 points and 6.8 boards in the playoffs. Conley would have his best year as a Celtic the following season, averaging nearly 19 minutes a game during the regular season to score 6.7 points while hauling in 8.3 rebounds on average over 71 games in the regular season. The Celtics repeated as NBA champions with a 4–3 finals win over the St. Louis Hawks, with Conley roughly duplicating his regular-season averages during the playoffs. Conley would play on one more championship Celtics team during the 1960–61 season, culminating in a 4–1 defeat of the Hawks. Conley skipped the following NBA season while pitching for the Red Sox, then joined the New York Knicks where he averaged 9.0 points and 6.7 rebounds in 70 games during the 1962–63 season, before his minutes dropped precipitously the following year which was his last in the NBA. In six seasons in the NBA, Conley averaged 5.9 points and 6.3 rebounds per game in 16.5 minutes of playing time. Conley's No. 17 would subsequently be assigned to John Havlicek and then retired by the Celtics in recognition of Havlicek's career. "When I look back, I don't know how I did it, I really don't", Conley was quoted saying in 2008 by the Los Angeles Times, on playing two professional sports in tandem. "I think I was having so much fun that it kept me going. I can't remember a teammate I didn't enjoy." When Abe Saperstein's American Basketball League (1961–62) was born in 1961, Tuck Tape Company owner Paul Cohen purchased a franchise, gave it the Tapers name, and placed it in Washington, D.C.; the team played its games in the Washington Coliseum. Conley signed with the team. While with the Tapers, Conley often accompanied Cohen on sales calls for his company and gained industry experience. Conley is one of 13 athletes to have played in both the National Basketball Association and Major League Baseball. The thirteen are: Danny Ainge, Frank Baumholtz, Hank Biasatti, Conley, Chuck Connors, Dave DeBusschere, Dick Groat, Steve Hamilton, Mark Hendrickson, Cotton Nash, Ron Reed, Dick Ricketts and Howie Schultz. Retirement After his