7) Jhoulys Chacin’s 2013 season (Age 25 season)
As it was in 2011 (and number 18 on our list), Jhoulys Chacin was a victim of bad run support and seemingly figured out Coors Field, which is something that many pitchers had by this time.
In 2013, he was coming off an injury-plagued 2012 season and he flourished once again. He went 14-11 on the season with an ERA of 3.47 in 31 starts. In 197 1/3 innings, he had an ERA+ of 129. His FIP was exactly that of his ERA (3.47), his walk rate was at his career-low (2.8 BB/9) and his home run rate (0.5 HR/9) dropped by more than half of what it was in 2013 (1.3 HR/9) and nearly half of what it was in 2011 (0.9 HR/9).
He was pretty good at Coors Field (9-5 with a 4.18 ERA in 18 starts) but he was even better on the road in 2013. However, he got less run support on the road. He was only 5-5 in 13 starts but had a phenomenal ERA of 2.44.
6) Nolan Arenado’s 2015 season (Age 24 season)
This was the season that Nolan Arenado really broke out for the Rockies. He played in more than 133 games for the first time in 2015 and his offense really stepped up a notch or two from his 2014 numbers.
In 157 games, Arenado had 97 runs, 177 hits, 43 doubles, 42 home runs, 130 RBI, 34 walks, 110 strikeouts, a .287/.323/.575 slash line, a 124 OPS+, and 22 DRS.
Both the home runs and RBI led the league as did the total number of extra-base hits, the doubles were second, the slugging percentage was second, the .898 OPS was 5th, his hit total was 5th in the league.
He had a WAR of 6.3 in this season.