Joe Kelly is set to return to the Cardinals starting rotation Friday, which isn't exactly an earth-shattering development in Fantasy, but he's useful for certain formats.
Specifically, owners in Head-to-Head points leagues may want to take advantage of his relief pitcher eligibility. A quality starting pitcher tends to outscore the average closer in that format, and Kelly has been a quality starter when he's gotten the chance to start over the last three seasons. He hasn't been an especially flashy one, but that doesn't matter so much in points leagues, where strikeouts are worth only half a point.
Kelly isn't a great source of WHIP either, but he keeps runs off the board and is usually a good bet for a quality start, which is worth three points in standard CBSSports.com leagues. And while the Cardinals haven't had great success offensively this year, I think their talent eventually wins out and they make the playoffs as a wild card. A late-season surge would probably be reflected in Kelly's win-loss record.
Again, he's not the most exciting pitcher, and if I wanted a starting pitcher who I could slot as a reliever, I'd turn to Kevin Gausman, Carlos Martinez or Rubby De La Rosa before resorting to him. But Kelly has his place in Fantasy.