Scott Van Slyke has a .423 on-base percentage against lefties this season, but both his home runs have come against righties. (Jon SooHoo/Los Angeles Dodgers)

Dodgers at Rockies, 12:10 p.m.

Joc Pederson, CF

Chris Heisey, RF

Adrian Gonzalez, 1B

Howie Kendrick, 2B

Justin Turner, 3B

Alex Guerrero, LF

Kiké Hernandez, SS

Austin Barnes, C

Juan Nicasio, P

By Jon Weisman

Scott Van Slyke, who has been ailing with back inflammation, has been placed on the 15-day disabled list, with Chris Heisey returning from Triple-A Oklahoma City to take his place on the roster.

Van Slyke has only played once in the past eight days. He has been in a 4-for-36 slide with two walks and no extra-base hits, dating back to May 13.

He joins Yasiel Puig and Carl Crawford on the disabled list, though Puig continued to progress toward a return by taking live batting practice today in Colorado, according to Ken Gurnick of MLB.com.

This will be a fish-or-cut-bait stint for the Dodgers with Heisey, who will now have the five years’ service time to refuse a minor-league assignment.

Ian Thomas, one of the pitchers acquired from Atlanta, in the Juan Uribe/Chris Withrow trade, has also been called up from Oklahoma City as the 26th man permissible for today’s doubleheader.

Thomas, who would be the first Ian in Dodger history if he gets into a game, had a 0.00 ERA in 12 2/3 innings with Triple-A Gwinnett this year, before giving up six runs in 2 1/3 innings during his only appearance with Oklahoma City.

For the Dodgers’ only doubleheader last year, the 26th man was Red Patterson, who started the second game at Minnesota and allowed one run on five baserunners in 4 2/3 innings. Patterson is currently rehabilitating from Tommy John surgery.