After making a huge splash in fantasy in 2017, Cody Bellinger felt like a disappointment last year. He appeared in all 162 games with 84 runs, 25 home runs, 76 RBI, 14 stolen bases and a .260/.343/.470 slash line in 557 at-bats. Regression seemed likely to affect Bellinger, but there’s some interesting underlying data to peruse before trying to discern how his 2019 will play out.

In the second half, Bellinger hit .285/.369/.453 over his last 214 at-bats. His improvement in batting average did come with a cost. Bellinger’s isolated power fell to .168 but he improved in both walk percentage (11.1-percent) and strikeout rate (23.8-percent). He also raised his hard hit percentage to 42.7-percent compared to 38.5 in the first half.

Bellinger also improved his discipline metrics cutting his swinging strike percentage to 12.3-percent last year while improving his contact percentage to 72.4-percent. It remains to be seen if Bellinger can replicate his fly ball propensity from his...