LOS ANGELES - The Los Angeles Dodgers today acquired right-handed reliever Josh Fields from the Astros in exchange for minor league first baseman Yordan Alvarez.

Fields, 30, went 1-0 with one save and a 1.65 ERA in 23 relief appearances for the Astros' Triple-A Fresno this season, limiting opponents to a .192 batting average with a 0.65 WHIP. He also made 15 appearances for the Astros this year, posting a 6.89 ERA (12 ER/15.2 IP), and went 9-10 with nine saves and a 4.53 ERA in 164 big-league games with Houston in four seasons from 2013-16, averaging better than a strikeout per inning in the Majors with 197 Ks in 159.0 innings. He was originally selected by the Mariners in the first round (20th overall) of the 2008 First-Year Player Draft out of the University of Georgia.

Alvarez, 19, was signed by the Dodgers as an amateur free agent on June 15 out of Las Tunas, Cuba.

To create room on the 40-man roster, the Dodgers transferred left-handed pitcher Hyun-Jin Ryu (left elbow tendinitis) to the 60-day disabled list.