No. 1 Carlos Carrasco
Carlos Carrasco is currently having his worst season on record, most contributed to his pitches not seeming as dominant as they have recently. Most of his stats and projections are at all-time lows too. Since the All-Star break in 8 games, his record is 0-5 with a 10.24 ERA.
When it comes to giving up Hard-Hit balls, he's one of the worst in the league. xERA is a 1 to 1 of Expected Weighted On-Base Average (xwOBA) converted to an ERA scale. It uses stats like (strikeouts, walks, hits, hit-by-pitch) and the quality of at-bats for hitters like (Exit Velo and Launch Angle), all of which he has struggled with this season. In his 20 games of 2023, his xERA is a shocking 6.76, which is one of the worst in the league. His career high prior to this was 4.96. While in 20 games in 2023, his record is 3-8 with a 6.80 ERA, but you can say at least it can't get much worse. It's unlikely too many teams will try and acquire him in free agency, so he could be a steal for a bounce-back player.