MLB Investigating Astros Pitcher For Alleged Anti-Gay Slur Toward Mariners Rookie

Astros reliever Hector Neris had altercation with Mariners rookie Julio Rodriguez, causing benches to clear.
Neris allegedly used anti-gay slur against Rodriguez, who was former teammate on Dominican Republic team.
Neris apologized but denies using slur; Rodriguez expresses hurt but declines further comment.
MLB has opened investigation into incident that escalated tensions between AL West rivals.
Outcome could impact playoff positioning as Astros and Mariners battle for postseason spots.