Finished 2nd in the National League Rookie of the Year voting behind Cody Bellinger (LAD)...Made his Major League debut on 5/28 at COL and homered in his first plate appearance, a pinch-hit at-bat against Rockies' closer Greg Holland, the 9th Cardinals player to homer in first at-bat...Led the Cardinals with 25 home runs, the first rookie to lead the team in home runs since Albert Pujols hit 37 in 2001...Ranked 2nd on the Cardinals with 52 extra base hits. His 52 extra base hits in his first 108 MLB games ranked 2nd in Cardinals history (Albert Pujols, 54), 2nd in MLB in 2017 (Cody Bellinger, LAD, 58) and T20th in MLB history behind the leader (Joe DiMaggio, NYY, 77)...His 25 home runs in his first 108 MLB games ranked 2nd in Cardinals history (Albert Pujols, 26), 2nd in MLB in 2017 (Cody Bellinger, LAD, 36) and T13th in MLB history with Frank Robinson and trailing the leader (Bellinger & Mark McGwire, OAK, 36)...His 20 home runs playing the shortstop position were 2nd in Cardinals history (Jhonny Peralta, 21, 2014) and tied Cal Ripken, Jr., for 8th-most by an MLB rookie shortstop... Named National League Rookie of the Month for July, leading all MLB rookies in home runs (8) and hits (28)...Set the Cardinals rookie record for home runs in the month of July with 8...Led the Cardinals in slugging percentage (.532), but did not qualify for the MLB leaders...Ranked among National League rookie leaders in runs (55, 5th), hits (119, 4th), doubles (26, T1st), home runs (25, T4th), RBI (65, 4th), extra base hits (52, T3rd), total bases (222, T3rd), game-winning RBI (5, T8th) and hit by pitch (4, T5th)...Had eight extra base hits in a three-game series (7/7-9 vs. NYM), the most by a Cardinals player in a three-game series in the modern era (post 1900)...Tallied four extra base hits vs. NYM (7/8) with three doubles and a home run, becoming the first Cardinals shortstop and No. 8 hitter to ever hit four extra base hits in a single game. Also became the first Cardinals rookie with four extra base hits in a game since 1935 (Terry Moore, 8/28/1935 at PHI)...Hit safely in six straight plate appearances (7/7-7/9)...Tied for Cardinals team lead with 10 three-plus hit games... Homered in consecutive games eight times with a season-high streak of three games (7/7-9)...Tallied an extra base hit in five straight games (9/26-30) with a double in three straight games (9/26-28), both were his season-highs...Posted the Cardinals single-game high with three doubles (7/8 vs. NYM)...Had an RBI in six straight games (7/21-26), the longest streak by a Cardinal and T4th longest in the National League (7, J.D. Martinez, Parra, Yelich)...Hit 38 home runs in 156 games played between St. Louis and Memphis (AAA)...Played in 48 games with Memphis, batting .299 with 13 HR, 34 RBI and nine doubles.