credited golf with helping him overcome the mental exhaustion he faced after the season, and entered 2013 in a relaxed frame of mind. By 2013, De Fratus was a regular member of the bullpen, pitching in 58 games with the big-league club; he performed well enough to be considered likely to open the 2014 season firmly implanted in the Phillies bullpen. He broke spring training 2014 with the major league team, but after four appearances, he was optioned back to the minor leagues to work on commanding his pitches, notwithstanding the Phillies' dearth of other right-handed relieving options. While at Lehigh Valley, he spent a significant amount of time reviewing film from his outings in 2011 and 2012, from which he learned that he had a faster pace when pitching, a more aggressive pitching style, and a lower arm slot. Just under a month later, in late May, he was recalled to the major league team, and had much success (11 consecutive scoreless appearances) as part of a Phillies' bullpen that drastically improved from the beginning of the season, and, statistically, was among the best in the major leagues in early June. De Fratus' drastically improved command helped him halve his career walk rate – he walked just 5.5% of batters he faced in 2014, which contributed to a "breakout" season. Although he was overshadowed by the emergence of fellow relief pitcher Ken Giles, De Fratus established himself as a reliable late-innings reliever for the future. Seattle Mariners A free agent following the 2015 season, De Fratus signed a one-year contract with the Seattle Mariners on December 2. He was released on March 16, 2016, and re-signed to a minor league contract the following day. Texas Rangers On June 11, 2016, De Fratus was traded to the Texas Rangers. San Diego Padres On February 28, 2017, De Fratus signed a minor league deal with the San Diego Padres. He was released a month later. Southern Maryland Blue Crabs On April 6, 2017, De Fratus signed with the Southern Maryland Blue Crabs of the Atlantic League of Professional Baseball. Seattle Mariners (Second Stint) On May 9, 2017, De Fratus signed a minor league deal with the Seattle Mariners. He elected free agency on November 6, 2017. Los Angeles Dodgers On February 17, 2018, De Fratus signed a minor league contract with the Los Angeles Dodgers. He was named to the mid-season