Detroit Tigers starting pitcher Jack Flaherty is giving up fly balls at a career-high rate, a bad sign in home-run happy MLB.

This article was originally published on www.si.com/mlb/tigers as Tigers Should Have Major Concerns About Jack Flaherty After Struggles Against Royals. Jack Flaherty had a resurgent year with the Detroit Tigers last season, and that gave him the opportunity to win a World Series championship with the Los Angeles Dodgers.

What do you call a pitch that looks like a fastball out of hand, mimics a slider and is actually neither? Diabolical. Meet Jack Flaherty's knuckle-curve.