In 11 years with the Boston Red Sox, Fisk was selected to seven All-Star games, and batted .284 with 161 home runs and 568 RBI. He nearly had more RBIs than strikeouts, striking out only 588 times in 4353 plate appearances with the Red Sox, with an OBP of .356. Fisk was signed by the White Sox on March 18, 1981. At that time, his old number 27 was held on the White Sox by pitcher Ken Kravec. Fisk flip-flopped his old number and thus wore the unusual baseball number of 72 on his jersey. Although Kravec was traded just ten days later, Fisk retained the number 72 throughout his career with the White Sox. As the season got under way, Fisk was interviewed by the media concerning his switching teams, and joked that "after a decade with the Red Sox, it was time to change my sox!" On opening day 1981, Fisk started the season with the White Sox against his former team in Fenway Park. In the eighth inning, Fisk knocked a three-run homer to put his new team on top, 5–3. After joining the White Sox, he helped the team win its first American League Western Division title in . His .289 batting average, 26 home runs, and 86 RBI, as well as his leadership on the young team, helped him to finish third in the MVP voting (behind Baltimore teammates Cal Ripken, Jr. and Eddie Murray). Fisk also caught LaMarr Hoyt that season, the 1983 Cy Young Award winner. Fisk played poorly in Chicago's loss to the Baltimore Orioles in the 1983 ALCS, hitting .176 with zero runs batted in. On May 16, 1984, Fisk accomplished the rare feat of hitting for the cycle in Comiskey Park against the Kansas City Royals. Fisk's triple in the bottom of the seventh inning off Dan Quisenberry was the only triple he hit in the season. Injuries once again befell Fisk in the 1984 season, limiting him to just 102 games and a .231 average. The experience led him to begin a new training regimen which he used for the rest of his career. In his Hall of Fame induction speech, Fisk credited White Sox strength and conditioning coach Phil Claussen for his turnaround. Claussen introduced Fisk to a more scientific approach to physical conditioning which included long sessions of weight training. Fisk often credited the training program with extending his career. In 1985, following the advent of his new training program, Fisk had the most productive offensive year of his career.