Thomas was the Diamondbacks' Opening Day center fielder last season, but he got off to such a poor start that he found himself back in the minors by mid-May. The speedy youngster returned following a month-long stint on the farm and started out hot at the dish, but he eventually slowed down and wound up slashing only .245/.282/.395 with seven home runs and six stolen bases over his final 86 games. Arizona continued to ride with Thomas' glove during their surprise postseason run and it was rewarded with four long balls. Some improvement from Thomas is a reasonable expectation given his pedigree, but a .290 xWOBA, 4.7 percent walk rate and .435 OPS versus lefties don't provide much encouragement. The good news is Thomas' defensive work should give him a little leash. Read Past Outlooks