The Cubs are adding left-hander Antoine Kelly to the roster for a weekend series against the Yankees, the team announced. Kelly will be making his big-league debut when he appears in a game. The 26-year-old has a strong 2.79 ERA with a 26.5% strikeout rate in 13 appearances at Triple-A Iowa. Perhaps most importantly, Kelly has an 8.4% walk rate since joining the organization, one of the better marks of his career. He’s routinely posted strong strikeout numbers in the minors, but it’s typically come with untenable walk rates.