The Indians outhit Seattle 18-5, and took advantage of Leone’s control trouble to win.
Lonnie Chisenhall drew a leadoff walk from Leone (0-4), the Mariners’ eighth pitcher. With one out, Jose Ramirez doubled off first baseman Logan Morrison’s glove.
Jason Kipnis was intentionally walked to load the bases and Brantley, the son of former Mariners outfielder Mickey Brantley, walked with two outs. David Murphy followed with a two-run single.
Zach McAllister (1-2) got the win and Austin Adams pitched the 12th for his first save.
Kipnis had a pair of doubles. Brandon Moss had four hits for the fifth time in his career and Ryan Raburn added a solo homer for the Indians.
The Indians set season highs for hits and runners left on base (17).
It was the AL-leading eighth extra-inning game for Seattle (4-4).
Seattle scored three runs in the fifth on a throwing error by third baseman Mike Aviles, Austin Jackson’s single and Robinson Cano’s sacrifice fly.
The Indians played the game under protest because of a disputed third out in the 12th.
Mariners: RHP Hisashi Iwakuma (strained lat), on the DL since April 24, is ahead of schedule. The team said he could be throwing from a mound within a week.
Indians: INF Carlos Santana returned to the club after missing three games to be with wife Brittany, who gave birth Thursday morning to a girl. To make room, OF Jerry Sands, who hit a two-run home run Saturday, was returned to the Triple-A Columbus.
Indians: Off Monday, then start a series at Kansas City.
Mariners: RHP Felix Hernandez (8-1, 1.91) faces the Yankees. He’s 8-2 with a 2.11 ERA in his last 13 starts against them, with four complete games.