Nationals (2012) On February 2, 2012, Jackson agreed to a one-year contract with the Nationals. The contract was reported to be worth $11 million and to contain incentive bonuses for achievements such as postseason awards. Jackson went 10–11 with the Nationals with an ERA of 4.03. He became a free agent after the Nationals' elimination from the playoffs. Chicago Cubs (2013–2015) On January 2, 2013, Jackson signed a 4-year, $52 million contract with the Chicago Cubs. On April 14, he along with Michael Bowden broke the record for most wild pitches in an inning, with 5. He finished the year 8–18 with a 4.98 ERA. The 2014 season was even more dismal for Jackson. He finished the season with a 6–15 record, a 6.33 ERA over IP, and allowed opponents a .302 against him. Over the course of his final 9 starts, Jackson posted a 1–6 record with a 9.95 ERA. His final start against the Los Angeles Dodgers saw him give up 5 earned runs in just of an inning, leading to his subsequent demotion to the bullpen for the remainder of the year. Jackson entered 2015 competing for a spot in the starting rotation with Travis Wood, but lost after giving up 9 earned runs in 16.1 innings. He began the season as the long reliever in the Cubs bullpen. On July 19, the Cubs designated him for assignment. On July 27, the Cubs released Jackson, eating the $13 million remaining on his contract. The team also owed him the same amount through the 2016 season. Atlanta Braves (2015) On August 14, Jackson signed a contract with the Atlanta Braves for the remainder of the 2015 season. He made his first appearance with the Braves the next day. Jackson recorded his first career save in relief of Matt Wisler on October 4, 2015, the final day of the season. Miami Marlins (2016) On January 13, 2016, Jackson signed a one-year contract for $507,500 with the Miami Marlins. He was designated for assignment on May 31, 2016, when the team activated Mike Dunn from the disabled list. San Diego Padres (2016) After signing a minor-league contract with the Padres in June 2016, Jackson was called up and made his first start as a Padre on July 17, 2016. Baltimore Orioles (2017) On April 5, 2017, Jackson signed a minor-league contract with the Orioles. He was called up to the