An announcer once referred to Peter Sidorkiewicz as "Peter Alphabet," but when asked if he would change his name any time soon Sidorkiewicz said, "At least this way, I don't have to worry about being mistaken for somebody else."
After his parents moved from Dabrowa Bialostocka, Poland to Oshawa, Ontario Sidorkiewicz played his junior hockey with the Oshawa Generals of the OHA and after only one season he was selected by the Washington Capitals in the 1981 Entry Draft. He played for the Generals for four seasons before being traded to the Hartford Whalers in 1985. Sidorkiewicz played in the AHL for the Binghamton Whalers and was named to the AHL's second all-star team for 1987. He made a one-game appearance in the NHL the next season while spending the majority of the year in Binghamton.
The 1988-89 season saw Sidorkiewicz get more playing time after number-one goalie Mike Liut got off to a poor start for the season. He also saw his first action in the Stanley Cup playoffs, playing in two games, and was named to the all-rookie team for '89. In the middle of the next season, Liut was traded to the Capitals, thus giving Sidorkiewicz the starting job. He played for two more seasons in Hartford before being claimed by the upstart Ottawa Senators in the 1992 Expansion Draft.
The Sens traded Sidorkiewicz to the New Jersey Devils after only one season, and he spent most of his playing time the next few years in the AHL and IHL. He played one more game for the Devils in the 1997-98 season before leaving the game.