Shohei Ohtani could rightfully be brimming with confidence following a historic rookie season, but the Los Angeles Angels' two-way talent said Tuesday he still feels uncertain about his success.

The 24-year-old American League Rookie of the Year recently returned to Japan after undergoing offseason Tommy John surgery to repair ligament damage in his throwing elbow that will limit him to batting next season and likely keep him off the mound until 2020.

In an exclusive interview with Kyodo News, Ohtani said he was still short on self-confidence despite becoming the only player other than Babe Ruth to hit 15 home runs and pitch 50 innings in a season.