Jorge Orta's single scored Rick Manning from third in the bottom of the 10th inning of the second game as Cleveland swept Toronto in a double header to remain in first place, ahead of Baltimore, in the AL East.
In the first game, Miguel Dilone singled home Manning in the fifth inning as Cleveland won, 1-0.
Manning led off the bottom of the 10th inning of the nightcap with a triple to right off reliever Roy Jackson (0-2). Tom Veryzer and Dilone were walked to load the bases and Mike Willis replaced Jackson before Orta lined his single to right to give Bert Blyleven (5-1) a fifth straight win.
After being held hitless the first four innings by Jerry Garvin, the Indians took a 1-0 lead in the fifth. Toby Harrah doubled, took third on a wild pitch and scored on grounder by Bo Diaz, who reached first when third baseman Garth Iorg bobbled the ball.
Toronto ended a 20-inning scoreless streak against Cleveland pitching in the seventh. Iorg led off with a single, was sacrificed to second by Al Woods and scored on John Mayberry's single.
In the opener, Manning opened the Cleveland fifth with a single off Dave Stieb (3-4), was bunted to second by Duane Kuiper bunt and scored on Dilone's single to right.
Rick Waits (4-2) scattered nine hits over eight innings.