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The Mariners improved to 23-11 since April 9.
Both the Yankees and Mariners are off Thursday.
Seattle right-hander Luis Castillo Woo (3-3, 3.95) starts Wednesday afternoon.
Seattle RHP Bryan Woo (4-1, 3.25) starts Tuesday night.
The Sounders and Houston played to a 0-0 on March 22 in Seattle.
Seattle right-hander Emerson Hancock (1-1, 5.70 ERA) starts Monday night against the visiting New York Yankees.
Last season, Hankins appeared in all 17 games for the Seahawks and had 30 tackles, five tackles for loss and one sack.
The Mariners begin a six-game homestand Friday with three against the Blue Jays.
Mariners RHP Bryan Woo (4-1, 1.58 ERA) is scheduled to start the series finale Wednesday.
Mariners RHP Emerson Hancock (1-1, 6.62 ERA) starts the middle game of the series Tuesday night against LHP Jeffrey Springs (4-3, 4.98).