SS - Corey Seager, Los Angeles Dodgers
Season Stats: .300/.397/.512 (140 OPS+), 13 HR, 42 RBIs, 3.4 WAR
Starter Zack Cozart, a 31-year-old defensive whiz having his first good season with the bat, has put up comparable offensive numbers to Seager this year. But even while averaging 12 DRS per 1,200 innings during his career, his pre-2017 OPS+ of 82 isn't in the ballpark of Seager's total package. The 23-year-old phenom has picked up where he left off when winning NL Rookie of the Year honors and finishing among the top three in last year's MVP voting.