first major league home run off of Scott Feldman of the Chicago Cubs on May 1, 2013. His six home runs in May tied Evan Gattis for the most among MLB rookies. Gyorko had a .280 batting average through June 10, and missed the next 30 games due to a groin injury. Gyorko batted .100 in July, but he improved his on-base percentage and on-base plus slugging in August, and passed Gattis with 16 home runs. He continued to swing at pitches outside of the strike zone and not draw enough walks. Gyorko finished the season as the team leader in both home runs (23) and RBIs (63). He led all MLB rookies that season in OBP (.301), SLG (.444), and home runs, and his home run total was the third-most ever by an MLB rookie second baseman. He broke the Padres' record for home runs by a second baseman, passing Bret Boone's 19 in 2000. Gyorko was also the first MLB rookie second baseman to lead his team in RBIs. Additionally, he became just the second rookie to lead the Padres in either category since Nate Colbert in San Diego's inaugural season in 1969. He was named to Baseball Americas All-Rookie Team, and finished sixth in NL Rookie of the Year balloting. 2014 season Going into spring training in 2014, Gyorko began focusing on improving his plate discipline, while maintaining his aggressiveness in swinging at hittable pitches. He also lost weight in an effort to improve his flexibility. Gyorko agreed to a $510,900 salary for the 2014 season. On April 14, Gyorko signed a five-year extension with the Padres worth $35 million, which was the third largest for a player with only one year of service in the majors. After committing four errors in his first 25 games, Gyorko increased his infield practice with Glenn Hoffman, the Padres' third base and infield coach. After struggling to start the season, with a .162 batting average, the Padres placed Gyorko on the 15-day disabled list on June 6 due to plantar fasciitis in his left foot. After missing 44 games, Gyorko was activated off the disabled list on July 28. With his 31st career home run on August 16, Gyorko succeeded Mark Loretta for most home runs as a Padres' second baseman. He batted .260 in his final 222 plate appearances of the year, but ended the season with disappointing numbers: