General manager Jerry Dipoto made his third trade in four days on Saturday, adding some relief pitching depth to the Mariners’ 40-man roster. Seattle acquired right-hander Nick Rumbelow from the Yankees in exchange for minor league pitchers JP Sears and Juan Then. “Nick is another young, power-arm reliever who provides us with present flexibility and future impact,” Dipoto said. Rumbelow, 26, spent the entire 2017 season in the Yankees minor league system, splitting time between Class AA Trenton and Class AAA Scranton/Wilkes-Barre. He posted a combined 5-1 record with six saves and a 1.12 ERA in 25 relief appearances. He pitched 40 1/3 innings, striking out 45 batters while allowing just 11 walks. Opposing batters hit .150 (21 for 140) against him and did not record a home run. It was a solid year considering Rumbelow missed almost all of 2016 with “Tommy John” surgery for a torn ulnar collateral ligament. He made just one appearance with Scranton/Wilkes-Barre in 2016 before being placed on the disabled list and undergoing surgery on April 19. He made his big league debut in 2015, making 17 relief appearances and posting a 1-1 record with a 4.02 ERA. He struck out 15 batter sin 15 2/3 innings pitched. Rumbelow was a seventh-round draft pick in the 2013 draft out of LSU.