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Rougned Odor, Rangers

After arguably one of the worst 30-homer seasons ever by a player in 2017 (.204 average, .252 on-base percentage), the 25-year-old vastly improved last year. While his home run total fell to 18, he hit .253 with a .326 on-base percentage. After a combined 58 errors at second base from 2015-17, he made just nine last season.