Chatwood got run over by Atlanta on Wednesday. It was the third time this season he allowed more than 2 runs:

On 4/24 he allowed 5 runs to Atlanta and followed it up by shutting out @Dodgers for 6 innings.

On 7/3 he allowed 6 runs to the Dodgers and followed it up by allowing 2 runs in 6.2 innings @San Diego.
Today he follows up the Atlanta game @Mets where he has logged 10 innings the last two years and has not allowed a run. The Mets are without David Wright and are 3-7 their last 10 games. They scored 24 runs with a .225 BA and .310 SLG during those games. They are also 26th in the league in OPS v RHP (.679).
Colorado ranks 8th in runs scored v RHP and 6th in OPS (.762). Also, the starter Mejia for the Mets admitted after his game against Miami on Wednesday that the bone spur in his elbow, which is slated to be surgically removed after the season, was bothering him.
Umpire info hasn't been released yet. Temperature in NY is forecast at 74 degrees and sunny with 0% chance of rain. Probably lock in the Rockies ML later when the umps come out.