Lawrence was recalled from Triple-A Tacoma on Monday.
Lawrence will rejoin the Mariners for the second time this season after a successful first stint with the big club; the 29-year-old posted a 3.29 ERA and 16:3 K:BB through 13.2 innings (five appearances) earlier in the season. He'll take the spot of Emilio Pagan in the Mariners' bullpen, where he'll likely serve as a long-relief option.