TBS analyst Ron Darling, who'll call two of the Astros' upcoming games for national broadcasts, discusses various Houston topics ahead of the stretch run.

This article was originally published on www.si.com as Astros Provide Positive Update on Slugger Yordan Alvarez's Injury Rehab. As they attempt to hold off the Mariners in a furious American League West race, the Astros may soon have back one of their most formidable weapons.