Harris (4-4) took the loss against the White Sox on Saturday, allowing a game-winning solo home run to the only batter he faced.
Harris (4-3) got the extra-innings win against the Astros on Tuesday, allowing an unearned run on one hit over two innings. He struck out three.
Harris (3-3) got the win against the Mariners on Tuesday, firing three scoreless innings during which he allowed two walks and recorded three strikeouts.
The Athletics recalled Harris from Triple-A Las Vegas on Saturday.
Harris owns a 2-2 record, 4.94 ERA and 1.83 WHIP across 27.1 innings over five starts since being optioned to Triple-A Las Vegas on July 26.
The Athletics optioned Harris to Triple-A Las Vegas on Friday.
Harris did not factor into the decision in Friday's 6-2 win against the Phillies, allowing two runs on three hits and six walks with no strikeouts over three innings.
The Athletics reinstated Harris from the paternity list Friday. Harris will start Friday's game against Philadelphia.
Harris (personal) is in line to return from the paternity list to start Friday's game in Philadelphia.
The Athletics placed Harris on the paternity leave list Tuesday.