Pittsburgh Steelers finished 11–5. On January 3, 2014, he played in his first career postseason game as the Steelers lost in the AFC Wildcard to the Baltimore Ravens. 2015 On April 9, 2015, the Pittsburgh Steelers exercised the fifth-year option on DeCastro's rookie contract, paying him a salary of $8.07 million for 2016. He also received a $3.20 million signing bonus for 2016. In his fourth season with the Steelers in 2015, DeCastro started in all 16 regular-season games and was elected to his first Pro Bowl. Pro Football Focus gave him an overall grade of 83.4 and ranked him the 15th-best offensive guard in 2015. He was ranked the ninth best offensive guard by Sports Illustrated after he surrendered only 1.5 sacks in 590 pass blocking attempts and was flagged for three penalties (all false starts) all season. 2016 On September 8, 2016, the Steelers signed DeCastro to an additional five-year, $50 million extension. The contract includes a signing bonus of $16 million. Together, both extensions bring his present contract to a six-year, $58.07 million deal including a total signing bonus of $16.00 million and signs him throughout 2021. He started all 16 regular season games and brought his consecutive games played streak to 56 in-a-row. The Pittsburgh Steelers finished first in the AFC North after achieving an 11-5 record in 2016. They went on to defeat the Miami Dolphins in the AFC Wildcard, the Kansas City Chiefs in the AFC Divisional, and lost the AFC Championship to the New England Patriots. The Pittsburgh Steelers offensive line was ranked the third best by Pro Football Focus, with DeCastro being ranked as the Steelers' top run blocker. He was named to his second-straight Pro Bowl for the 2016 season. He was also ranked 97th on the NFL Top 100 Players of 2017. 2017 On December 19, 2017, DeCastro was named to his third-straight Pro Bowl along with fellow Steeler offensive linemen Alejandro Villanueva and Maurkice Pouncey. He was ranked 44th by his peers on the NFL Top 100 Players of 2018. DeCastro started and played in the first 15 games of the season and skipped week 17's game against the Cleveland Browns because the Steelers' had clinched a playoff berth. 2018 In week 1 against the Cleveland Browns, DeCastro fractured his right hand and was forced to miss the next two games against the Kansas City Chiefs and Tampa Bay