Chadick started his professional basketball career with Amsterdam in the New York State League (NYSL), appearing in nine games and scoring 87 total points in the 1939–40 season. For the 1940–41 season, he returned to Delaware and played for the independent St. Hedwig's Huskies. The General Chemical team eventually made the league championship, where Chadick's "sensational long-range firing of field goals" helped them win the final game 42–39 against DuPont. In the game, which was the third and deciding match of the series, Chadick scored 19 points in what was described as "one of the most exciting and bitterly contested games of the season." League president P. Newton Pew said that "Chadick's selection on the [all-star] team honors not only the best player in the league but one of the finest gentlemen as well. Chadick never complains to officials, never displays unsportsmanlike, and is always a gentleman." On November 24, 1941, Chadick was signed by the
Wilmington Blue Bombers of the
American Basketball League (ABL). In mid-December, it was announced that Chadick was lost for the remainder of the ABL season, as he was employed by the Sun Shipbuilding Co. which had a team in the Delaware River Basketball League (Delri League) that played on the same days as Wilmington. He stated that it was impossible for him to play for both teams at once. In a game against the Laurel Merchants, Chadick scored 43 points. He finished the ESBL season fourth in the league in scoring with 202 points. For the 1942–43 season, Chadick returned to the IBL and played for Pusey & Jones. Pusey & Jones eventually won the league championship in March, 57–37 against DuPont with Chadick scoring 12 points in the game. He also played for the Wilmington Y. M. C. A. basketball team. From January to April 1943, Chadick played for St. Ann's in the C. Y. O. Basketball League, leading them to the league championship against St. Thomas. In February, Chadick was named by league president Jim McGonegal as someone who would be on the Catholic League/C. Y. O. League all-time team. McGonegal also stated that the duo of Chadick and Bill McCahan on St. Ann's was the best combination in league history. In October 1943, Chadick tried out for the Wilmington Blue Bombers of the ABL. He made the team and scored their first points in the season opener, a win against the
Brooklyn Indians. In November,
Journal-Every Evening journalist Dick Rinard wrote that "Paul Chadick has proven to any skeptics who may have doubted his big league caliber that he can go in any competition." By the end of 1943, he was tied with
Ed Sadowski for the team lead in scoring, with a newspaper writing that he "totalled[sic] only three points in the first three games of the season but has been banging them in steadily from the field since the fourth game." Chadick helped the team make the league championship round, where they went against the
Philadelphia Sphas to capture the ABL title. In the championship series, Chadick scored 57 points, only behind teammate
Moe Frankel (who scored 66) for the lead. In October 1945, he wrote a letter to the Blue Bombers manager stating he was in
Japan but hoped to return to Wilmington "before too much snow falls. While in Japan, he also played "quite a bit of basketball," according to
The Morning News. He left Japan on December 4, 1945, and came to
San Diego, California, on December 25. A week later, against the Philadelphia Sphas on January 27, Chadick led the team with 20 points scored. With Wilmington in the 1945–46 season, he appeared in a total of 17 games and scored 174 points. He was a replacement for Wilkes-Barre's leading scorer, Jack "Rocco" Hogan, who had suffered an injury. On November 22, against the
Trenton Tigers, he scored the game-winning shot with 10 seconds left to play to win 53–52. By December 13, Chadick was third in the ABL scoring with 147 points in 11 games, only behind
Saul Cohen (173) and
Bobby Dorn (155). He finished the season with 35 games played, 166 field goals and 71
free throws made for a total of 403 points. Chadick was signed by the
Elizabeth Braves of the ABL in November 1947. In December, he requested a release, after not playing in any games, and subsequently signed with the
Wilkes-Barre Barons of the ABL. He was released by Wilkes-Barre in January 1948. Afterwards, he played in the
Eastern Basketball League (EBL) for the
Sunbury Mercuries. He appeared in 7 games for the team, recording 55 points scored. He ended the season with a 4.57 point average in 23 games played between Wilkes-Barre and Trenton. He scored a total of 105 points in the ABL season, with 41 field goals and 23 free throws made. He played in 13 games for Trenton before a ruptured disk in his back led to him missing the rest of the season. "I was virtually helpless," Chadick said. He missed the 1949–50 season as a result of his injury, although he did take part in a benefit game with the Wilmington All-Stars. At the beginning of the 1950–51 season, Chadick received permission from doctors to play and signed with the
Lancaster Rockets of the EBL. His release was later reported on December 1. Shortly afterwards, he returned to Delaware and joined the St. John's team in the CYO League. In his first game with St. John's, Chadick scored 15 points and led the team to a 54–38 win over St. Paul's. At 32 years old, Chadick was the oldest player in the league but was still described as being "as good as ever." Chadick scored 18 points for the All-Stars (leading the team) in an exhibition against St. Mary's, helping them win 58–50 in a game that benefited the Delaware Day School for Handicapped Children transportation fund. In February 1951, he was selected to the Delaware All-Star basketball team that played against the Harlem Aces. Chadick led St. John's to a third-place finish in the CYO League. St. John's was entered after the CYO season to the Delaware senior basketball tournament, where they advanced through the quarter-finals before being eliminated by Kappa Alpha. ==Later life and death==