Adbert Alzolay Is in Control
Adbert Alzolay has been one of the few pleasant surprises for the Cubs this season. Through his first two major league stints across 2019 and ’20, he walked 15% of the batters he faced in 33.2 innings of work, most of which was in the starting rotation. Even when striking out 28.6% of opposing hitters, handing out free passes at such a high rate is not a sustainable way of working through a lineup and keeping runs off the scoreboard and without the aid of a .263 BABIP in those 33.2 innings, Alzolay’s results would have been even more concerning. Meanwhile the Cubs, after years of contending and struggling to develop pitchers internally, were bereft of exciting arms on the right side of the aging curve. This past offseason, ownership refused to spend in any meaningful way and the club was forced to ship out Cy Young candidate Yu Darvish for Zach Davies and a few prospects in the low minors. They did sign Jake Arrieta to a $6.5 million deal coming off a disappointing stint with the Phillies, but that signing represented Chicago’s most significant investment in pitching this offseason. These moves and circumstances meant that Alzolay would need to take a big step forward in 2021 if the Cubs wanted to remain competitive with the Cardinals and Brewers in what seemed to be a winnable AL Central.
But expecting Alzolay to make a substantial leap in terms of his control took some wishful thinking if you were scouting the statline. At his last stop in Triple-A in 2019, Alzolay walked 11% of batters in 65.1 innings. That figure is obviously better than the 15% he posted in his first innings in the majors, but it would still be a below average rate and that was while facing worse competition. For Alzolay to even have an average walk rate, he would have to cut his 2019 Triple-A rate by at least 20%, all while facing better competition. The odds were certainly not in his favor.
Miraculously, he has made the necessary adjustment. In 49.2 innings in 2021, Alzolay is now walking only 5.2% of batters in an environment where the league average is about 9%. Not only has he shaved his previous major-league rate by two thirds, but his 2021 mark now represents an elite figure, one that’s in the 88th percentile of all pitchers per Baseball Savant. Better yet, he has barely sacrificed any strikeouts. As I said in the introduction, Alzolay had a career 28.6% strikeout rate coming into 2021. This season, that rate is still a well-above average at 26.3%, especially relative to other starting pitchers. He has also increased the rate at which he induces groundballs (38.3% prior to this season, 45.7% in 2021), which should offset some of the strikeouts he has lost as he tries to hone his command. All of this has culminated in a 3.81 ERA through nine starts despite a bloated 20% HR/FB rate, the latter figure driving the massive difference between his FIP (4.21) and xFIP (a sterling 3.41). Read the rest of this entry »