 He recorded just one more victory in 1958, and completed the season with an 8–9 record, a 4.94 ERA, and 71 strikeouts in a career-high 149⅓ innings pitched.On February 8, 1959, the Red Sox announced that they had Sisler signed for the 1959 season.After what was considered a "disappointing" season, he did not impress with his first outing in spring training, giving up two hits and five bases on balls in just two innings of work.