Tanner Scott Rainey (born December 25, 1992) is an American professional baseball pitcher in the Pittsburgh Pirates organization.

[2] Rainey signed with the Reds, made his professional debut with the Billings Mustangs,[3] and spent the whole season there, pitching to a 2–2 record and 4.27 ERA in 15 starts.

He made his major league debut that same day against the Philadelphia Phillies, pitching one inning of relief and giving up a grand slam to Scott Kingery.

[8] Rainey was called up to the Nationals from the Triple-A Fresno Grizzlies on May 18, 2019,[9] and swiftly became one of manager Dave Martinez's go-to relievers.

[10] He earned his first career win in relief on June 1, beating Roark and the Reds at Great American Ball Park.

[12] The Nationals finished the 2019 year with a 93–69 record, clinched a wild card spot, and won the World Series over the Houston Astros.