Keaton Winn is a rare big league pitcher, and not just because he’s the only one who grew up in Ollie, Iowa, with a population of 201 in the 2020 census. The 26-year-old San Francisco Giants right-hander’s primary pitch is a splitter, and by a significant margin. Through seven starts this season, Winn’s usage breakdown is 42.2% splitters, 23.3% four-seamers, 20.4% sinkers, and 14.1% sliders. No starter in baseball has thrown a higher percentage of splits this season. With one notable exception, his atypical approach has yielded good results. Winn failed to get out of the first inning when he faced the Phillies in his most recent start, on May 4, but even with that turbulent outing — five runs in 2/3 frames — he has a respectable 4.41 ERA and a 3.97 FIP. In each of the three starts that preceded the debacle, he went six innings and allowed just one run. His next start is scheduled for this afternoon against the Rockies in Colorado, at 3:10 p.m. ET. Winn’s mix was even more splitter heavy a year ago. He made his MLB debut last June and proceeded to throw his signature offering an eye-opening 55.1% of the time in 42 1/3 innings. It’s understandable that he would prioritize the pitch — last month, our prospect writers Eric Longenhagen and Travis Ice called Winn’s splitter “devastating… one of the nastier ones in pro ball” — even if such an approach is unprecedented among starters. San Francisco’s fifth-round pick in the 2017 draft out of Iowa Western Community College is anything but ordinary in the way he attacks hitters. Winn discussed his splitter when the Giants played the Red Sox at Fenway Park earlier this month.
