Porter (back) has been upgraded from doubtful to questionable ahead of Sunday's game against the Warriors, Jonathan Feigen of the Houston Chronicle reports.
Porter was expected to miss a second straight game due to left lower-back soreness, but the point guard apparently made more progress than expected and is now more of a 50-50 call ahead of Sunday's 7 p.m. ET opening tip. Forward Kenyon Martin may receive another start if the Rockets have to mix up their lineup again.