By Chris Rosvoglou The White Sox made a significant move this Saturday prior to their game against the Cubs, designating left-handed pitcher Dallas Keuchel for assignment. Keuchel, 34, struggled mightily this season. In eight starts, the former Cy Young winner had a 2-5 record with a 7.88 ERA and 20 strikeouts. This is a disappointing end to Keuchel’s time in Chicago. He signed a three-year, $55.5 million contract with the White Sox in December of 2019. Unfortunately for Keuchel, he hasn’t performed at a high level since 2020. Last year, he owned a 5.28 ERA in 30 starts. Keuchel was at his bes…