President of Baseball Operations David Dombrowski made the announcement.
Martin, 25, spent the entire 2016 season with the PawSox in his Triple-A debut. He converted each of his six save opportunities and went 3-4 with a 3.38 ERA (25 ER/66.2 IP) and 10.53 strikeouts per nine innings in 36 appearances, all in relief. Opponents were only 10-for-65 (.154) against Martin with runners in scoring position, including 0-for-10 with the bases loaded. In 17 outings from June 20 through the remainder of the season, the right-hander posted a 2.29 ERA (9 ER/35.1 IP) and held opponents to a .207 batting average (25-for-121). Selected by the Red Sox in the ninth round of the 2013 June Draft, Martin has made each of his 120 professional appearances in relief, going 15-12 with 24 saves, a 3.41 ERA (87 ER/229.0 IP), 242 strikeouts, 63 walks, and 19 home runs allowed.
Ysla, 24, made 39 of his 40 appearances in 2016 with Double-A Portland before finishing his season with a solo outing for the PawSox. He combined to go 2-5 with four saves, a 3.99 ERA (25 ER/56.1 IP), and 62 strikeouts, pitching exclusively out of the bullpen for the first time in his career. From June 1 through the remainder of the season, the Venezuelan native held opponents to a .208 batting average (26-for-125) in 24 appearances between the two clubs. Originally signed by San Francisco as an international free agent in 2012, Ysla was acquired by the Red Sox from the Giants in exchange for Alejandro De Aza on August 31, 2015. He has made four relief appearances for Margarita of the Venezuelan Winter League, his third consecutive season pitching for the club.
BOSTON RED SOX 40-MAN ROSTER (40)
PITCHERS (22): Fernando Abad, Matt Barnes, Clay Buchholz, Roenis Elias, Heath Hembree, Williams Jerez, Brian Johnson, Joe Kelly, Craig Kimbrel, Kyle Martin, Henry Owens, Drew Pomeranz, Rick Porcello, David Price, Noe Ramirez, Eduardo Rodriguez, Robbie Ross Jr., Robby Scott, Carson Smith, Brandon Workman, Steven Wright, Luis Ysla.
CATCHERS (4): Bryan Holaday, Sandy Leon, Blake Swihart, Christian Vazquez.
INFIELDERS (9): Xander Bogaerts, Marco Hernandez, Brock Holt, Deven Marrero, Yoan Moncada, Dustin Pedroia, Hanley Ramirez, Pablo Sandoval, Travis Shaw.
OUTFIELDERS (5): Andrew Benintendi, Mookie Betts, Jackie Bradley Jr., Bryce Brentz, Chris Young.