Karros (back) is starting at third base and batting sixth Tuesday against the Diamondbacks.
The 24-year-old was scratched from the lineup for Sunday's game against the Mariners due to back spasms, but he's good to go after Monday's team off day. Karros returned from a concussion in early September and has a .214/.298/.429 slash line with two homers and four RBI in 11 games since coming off the IL.