Rockies top prospect Jon Gray set to start on Tuesday

Right-handed pitching prospect Jon Gray will make his major league debut for the Rockies against the Mariners on Tuesday at Coors Field. Gray is the top prospect in the Rockies system.

What It Means:

In twenty Triple-A starts this year Gray has a 4.08 ERA and 3.83 xFIP to go along with 8.65 strikeouts per nine. Against righties the Mariners have a .302 wOBA, 21.7 strikeout percentage, and .157 ISO. Our algorithm projects Gray to pitch 5.77 innings while allowing 3.88 earned runs on 6.22 hits and striking out 3.54 batters.