DENVER -- To say Derek Holland is upset with his performance in June and July would be an understatement.
The White Sox left-hander, who had led the starting rotation through the season's early months, was blown up early and often in his Coors Field debut on Friday night as the Colorado Rockies handed the South Siders a 12-4 defeat.
Holland allowed the first seven Rockies batters to reach base in what would be a four-run first inning. By the time Holland was pinch-hit for in the fifth, Colorado had seven runs on the board and a firm grip on the ballgame.
"It's a frustrating thing on my part," Holland said. "I'm not doing my job."

Even as the White Sox rebounded for a second-inning run, the Rockies responded. Colorado scored in each inning against Holland except the third, when Raimel Tapia's sharp double was all for naught.
"All the innings kind of ran together today for him," White Sox manager Rick Renteria said.
He struggled to fool the Rockies' hitters in a hitter-friendly ballpark, forcing just one swing-and-miss all evening. After entering Friday's game having allowed the third-highest rate of hard contact on fly balls and line drives in the Majors, according to Statcast™, Holland allowed hard-hit contact (balls with an exit velocity of 95 mph or more) seven times.
One of those came in the fourth on Charlie Blackmon's solo shot, a blast with an exit velocity of 104.7 mph that was his first homer allowed to a left-handed hitter since June 10, 2016, against the Mariners' Kyle Seager.

"We've been pounding in and going to my strengths," Holland said. "Everybody knows I'm going to pitch inside. Today I didn't execute very well with that, and whenever I made the right pitch, they hit it."
Holland signed with the White Sox as a free agent this offseason and quickly emerged as one of the most reliable starters in a struggling rotation. Through the end of May, his ERA stood at 2.37 -- best among White Sox starters. In his seven starts since, that ERA has been 10.16, allowing 35 runs in 31 innings.
"The most frustrating thing is being inconsistent," Holland said. "You have a good start, and then you have two bad ones. Today was flat out embarrassing. I don't even know where to begin."
Holland's struggled have paralleled those of the White Sox as a whole. The starting staff has a 5.73 ERA over its last 43 games, with just 10 quality starts. The club's 29 quality starts this season are the fewest of any team in the American League. Even amidst his struggles, Holland's two quality starts in June were the second-most of anyone in the rotation.
"To come out and [struggle], it's not helping the cause," Holland said. "I've just got to do a better job. That was pathetic today."