Jake Arrieta: 2015
From 2015 to 2016, former Cubs ace Jake Arrieta logged one of the most dominant stretches in baseball history. The second half of Arrieta's 2015 season was particularly dominant, where the bearded right-hander tossed 107.1 innings to the tune of a magnificent 0.75 ERA.
In a year where Los Angeles Dodgers co-aces Zack Greinke and Clayton Kershaw also put up video game-like numbers, Arrieta was able to squeak out the NL Cy Young with a 1.77 ERA over 229 innings with 236 strikeouts and a league-leading 22 wins. Arrieta also tied Kershaw in games started and complete games, one of which was a no-hitter against Kershaw and an elite Dodgers lineup.
Perhaps even more impressive than the no-hitter was Arrieta's complete game shutout against the Pittsburgh Pirates in the National League Wild Card game that year. Arrieta fanned 11 hitters and only allowed 5 hits on the evening to give the Cubs their first postseason victory since 2003.
Arrieta's herculean dominance continued into the 2016 season, where he threw another no-hitter against the Cincinnati Reds and was part of an elite pitching staff that helped win the Cubs their first World Series since 1908.
Arrieta was one of the greatest trade acquisitions in Cubs history and he was viewed as nothing more than a back-of-the-rotation starter when the Baltimore Orioles shipped him to Chicago alongside Pedro Strop in 2013.