Terrifying moment MLB star Luis Arraez lays motionless on field after sickening collision knocks him out cold

San Diego Padres infielder Luis Arraez was forced out of their game against the Houston Astros on a stretcher after a sickening collision knocked him out cold.

Arraez was running to first base in the opening inning at Minute Maid Park when he flew straight into the left shoulder of Astros utility player Mauricio Dubon.

In worrying scenes, the 28-year-old laid motionless on the turf before Dubon and Padres first-base coach David Macias quickly rushed over to check on him.

San Diego manager Mike Shildt and other MLB officials soon followed, before the rare use of a medical cart in an MLB game was required.

Arraez was eventually carted off the field while giving a thumbs up, before seemingly making his way to the hospital for examination. 

More to follow.