Graduated from University High School in Morgantown, W.Va., where he was a four-time All-Conference and three-time All-State honoree...helped lead his school to a West Virginia Secondary School Activities Commission (WVSSAC) state championship in 2004 and 2007...also lettered in basketball in high school and was named first-team All-State...played college baseball at West Virginia University where he was named to the Athletic Director's Academic Honor Roll and Big East Academic All-Star...recipient of the 2010 Brooks Wallace Award given to the top Division 1 shortstop...left West Virginia as the school's all-time leader in career batting (.404), doubles (73), extra base hits (113) and tied for first with 52 home runs...his older brother, Scott, played linebacker for the West Virginia University football team...he and his wife, Karley, have twin boys, Brody and Kadin (4/28/14)...resides in Morgantown, West Virginia...name is pronounced (JERK-oh).
Led the Cardinals with a career-high 30 home runs, the first Cardinal with 30 or more home runs since Carlos Beltran hit 32 in 2012. Ranked T11th in National League...Versatile infielder made starts at all four infield positions (1B-8, 2B-39, 3B-28, SS-25). Started & homered while playing at all four infield spots, the first in Cardinals franchise history to do so...Of his 30 home runs, 17 tied or gave the Cardinals the lead...Became one of two players in MLB history with 30 or more HR, less than 10 doubles (nine) and 400 AB or less, joining Mark McGwire (2000, STL)...Hit 23 HR after the All-Star Break, the most in the National League (T2nd MLB)...Hit 12 home runs in the 7th inning or later, T1st in the National League (Carter, MIL)...Was the first Cardinals middle infielder with 20 HRs since Jhonny Peralta in 2014...Hit home runs in consecutive games seven times to lead the Cardinals...Hit the Cardinals first home run of the season at PIT (4/5), the 50th of his career, becoming the first Cardinals second baseman to hit the team's first HR since Geronimo Pena vs. SF (4/7/93) in the 2nd game of that season...Batted .560 (14-25) against his former team, the Padres, with 6 home runs & four three-hit games. Homered in five straight games vs. SD, including a multi-HR in Game 2 of a DH on 7/20, his 4th career multi-HR game...Became the first Cardinals player to homer in five straight against the Padres since Albert Pujols (9/3/2001-7/2/2002) tying the club record and one shy of the MLB record held by Barry Bonds (2001) & Chipper Jones (2003-04) with six game streaks...Homered in both games of the 7/20 doubleheader vs. SD, the most recent Cardinal to do so since Troy Glaus at WSH (6/5/2008). Homered in both games of a doubleheader twice: 7/20 vs. SD & 7/26 at NYM, becoming the most recent player to HR in both games of a DH since Jacoby Ellsbury (BOS, 2011) and twice in a week since Bobby Bonilla (PIT, 1990)...Twice hit game-tying home runs in the 9th inning: vs. LAD (7/22) & at PHI (8/19)...Hit 10 HR in August, his career-high month (last Cardinal w/10 HR in a month: Carlos Beltran 10, May 2012)...Homered in three straight games twice (7/18-20  & 9/29-10/1).
Made his second-straight Opening Day roster and second straight Opening Day start on 3/30 vs. LAD…played in 111 games total, missing time while on the 15-day DL...Placed on the 15-day DL on 6/6 (retro to 6/4) with plantar fasciitis in his left foot and missed 44 games before returning on 7/28...After returning from the DL on 7/28, he hit .260 (51-for-196) with 12 doubles, five home runs and 27 RBI over his final 55 games...Hit .162 (33-for-204) over his first 56 games with five doubles, five home runs and 24 RBI from 3/30 - 6/3 before landing on the DL...Career-best 10-game hit streak from 9/9-19, hitting .324 (12-for-37)...Led the Padres for the second-straight year with 51 RBI, his first two years in the Major Leagues...With 50 of his 51 RBI coming at 2B, collected 50+ RBI in his first two Major League seasons (63 in 2013, 56 at 2B), becoming just the fourth NL player since 1920 to have 50-or-more RBI in each of his first two Major League seasons (partial or full) while playing 2B...Had his second career multi-homer game on 5/9 vs. MIA, including his second-career grand slam and a career-high total six RBI on the day, the most RBI by a Padre in 2014...Also had a grand slam on 8/16 at STL to give the Padres an 8-5 lead...Became the fastest player in team history to reach 100 RBI with his 100th on 8/16 at STL in his 199th career game...With all 10 of his home runs coming at 2B, ended the season with 33 career home runs coming at 2B, surpassing Mark Loretta (30 at 2B) to become the Padres all-time home run leader at 2B...Signed by the Padres to a contract through the 2019 season with a club option for the 2020 season on 4/14.
Made his Major League debut as the Opening Day second baseman and led the club with 23 homers and 63 RBI...named the Favorite New Padre by the Madres...Became the 28th rookie in club history to start on Opening Day...Played in 125 games total…since it became an official stat in 1920, he became the first rookie second baseman to ever led his team in RBI…the only other Padre to lead the team in RBI as a rookie was first baseman Nate Colbert who recorded 66 in 1969...Led all qualifying Major League rookies with 23 home runs, 49 extra-base hits, 216 total bases, a .301 on-base percentage, a .444 slugging percentage and a .745 OPS while also ranking among rookie leaders in several other offensive categories, including RBI (2nd, 63), doubles (3rd, 26), runs scored (3rd, 62) and hits (5th, 121)...Became the third rookie second baseman in Major League history to hit 23-or-more home runs in a single season, joining Dan Uggla (27 for Florida in 2006) and Joe Gordon (24 for New York-AL in 1938)...His 23 home runs were the most in franchise history by a second baseman and were the second-most all-time by a Padres rookie, behind only Nate Colbert's 24 in 1969...His 26 doubles were the eighth-most all-time by a Padres rookie and most since Yonder Alonso set the club's rookie-record with 39 doubles in 2012…the 26 doubles were the third-most by a Padres rookie second baseman in a season, behind Josh Barfield (32 in 2006) and Dave Campbell (28 in 1970)...Posted a .992 fielding pct. at second base (4 errors in 502 total chances) which ranked fourth in baseball and was the best-ever among rookie second sackers while his four errors were the fewest among qualifying rookie second basemen in MLB history (min. 108 games)...Recorded his first career hit in his big league debut with a double on Opening Day, April 1 at New York-NL off Mets' starter Jonathon Niese...Recorded his first career home run on May 1 at Chicago-NL at Wrigley Field off of Chicago's Scott Feldman...In 62 games at home, hit .237 (56-for-236) with 12 doubles and 13 of his 23 home runs…his 13 homers were tied with Chase Headley (2012) for the third-most all-time in a single-season at Petco Park behind Will Venable (15 in 2013) and Adrian Gonzalez (14 in 2008)...Recorded 15 homers and 38 RBI over 62 games in the second-half, both the most by a Padre following the All-Star Break...Had a season-long and a career-best eight-game hit streak from May 26 - June 3 (.324, 11-for-34)…also posted two six-game hit streaks and three five-game hit streaks in 2013. ..Hit .303 (30-for-99) with six doubles, six homers, 12 RBI and 20 runs over 26 games in May…ranked among rookie leaders in May in runs (1st, 20), home runs (T1st, 6), hits (2nd, 30), average (3rd, .303), RBI (3rd, 12) and OPS (2nd, .907)...Collected a career-high four hits on June 7 at Colorado, going 4-for-5 and falling a triple shy of the cycle with a double, homer, two runs and a RBI...Missed 30 games due to a right groin strain…placed on the 15-day DL on June 10 and reinstated on July 12 after playing in two rehab games with Single-A Lake Elsinore...also appeared in one game with Double-A San Antonio…was hitting .284 (66-for-232) at the time of landing on the DL on June 10…Padres went just 12-18 (.400) in his absence...Batted just .098 (6-for-61) in his first 16 games after returning from the DL...Collected eight homers and 17 RBI total over 25 games in the month of August, tied for the second-most homers in the National League in August and tied for most by a Padre (also, Will Venable)…eight homers in August were the most ever hit in a single calendar month by a Padres rookie in team history...Over 27 games in September, hit seven home runs and 20 RBI, tied with Carmelo Martinez (20 in June of 1984) for the second-most RBI by a Padres rookie in a single calendar month, behind Benito Santiago's 25 RBI in August of 1987...Over 62 games in the second half of the season, hit .226 (55-for-243) with nine doubles, 15 home runs and 38 RBI…his 15 home runs led all rookies in the second half while his 38 RBI were tied for the most after the All-Star Break with Tampa Bay and A.L. Rookie of the Year Wil Myers…his 15 homers in the second half were the most ever by a Padres rookie after the All-Star Break while his 38 RBI ranked fourth-most by a Padres rookie after the break...Recorded his first career multi-homer game on August 23 vs. Chicago-NL, collecting a career-high tying four RBI that day (2x, also, September 29 at San Francisco)...Hit his first career grand slam on the final day of the season, September 29 at San Francisco.
Spent the majority of the season with Triple-A Tucson, combining to hit .311 (155-for-499) with 30 home runs and 100 RBI in 126 games between Tucson and Double-A San Antonio...Began the season with San Antonio and was transferred to Tucson on May 17...From the time of his promotion to Tucson on May 17 through the end of the regular season, his 83 RBI led all players at the Triple-A level, while his 24 home runs ranked tied for second-most...His 30 homers total on the season ranked tied for sixth-most among all minor league players in 2012...Despite playing in just 92 games with Tucson, his 24 home runs ranked tied for fourth-most in the Pacific Coast League while his 83 RBI ranked sixth-most…his .588 slugging percentage ranked third-best in the PCL...With Tucson, hit .354 (34-for-96) against left-handed pitchers and .319 (87-for-273) off right-handers...Named the No. 7 prospect in the Padres organization by Baseball America heading into 2013 as well as No. 98 on Baseball America's Top-100 Prospects list, prior to the start of the season...Named a Triple-A All-Star by Baseball America following the season.