He Spent Two Days Watching. Tonight He Gets Wrigley.

The Dodgers traded for Tarik Skubal at the August 2nd deadline. He showed up in Los Angeles on a Saturday and spent Sunday in street clothes while his new team played without him. Tonight he makes his first start in a Dodger uniform, and the location they chose — Wrigley Field, against one of the best defensive teams in baseball — is either a baptism or a statement.

Skubal arrives as legitimate as his numbers: 2.79 ERA, 2.60 FIP, a K/BB ratio of 8.3 that is among the best in the American League. His changeup misses bats 50.9% of the time. The sinker-changeup sequence is the heart of everything he does. What he's walking into matters: Javier Assad has a 3.75 ERA at Wrigley but an xERA of 4.58 — he's been overperforming his underlying contact quality by nearly a full run. The Dodgers' Will Smith heads into tonight with a wOBA .064 below where his batted-ball profile says it should be. Pete Crow-Armstrong patrols center field for Chicago at +22 Outs Above Average — the best glove in baseball. Dansby Swanson plays short at +12. The Cubs don't win with luck tonight; they win with their gloves.

The wind blows in from left-center at 8 mph. The total is 9.0. Assad's sinker gets hit hard — 52.4% hard-hit rate on his most-used pitch. If tonight runs long into the Cubs' bullpen, Trent Thornton has already thrown 22 pitches in the last three days and may not be available. The Dodgers traded for an ace two days before this game. He's here now.

The board already gave its opinion. An 11.0 total is the market's way of saying it doesn't trust either pitcher to stop the other team's lineup inside a park where the air is thin and ground balls carry. Freddy Peralta was traded from the New York Mets to Tampa Bay on Saturday — two days ago — and Tampa Bay sends him to the park where the altitude makes every fly ball an argument.

Peralta's ERA is 4.99. His xERA is 3.83. The 1.16-run gap between them is the second-largest on tonight's slate: he has been more unlucky than bad. His fastball is the problem — he throws it 53% of the time, and hitters are squaring it up at 49.2% hard-hit rate. At Coors, 5,280 feet above sea level, fly balls go farther. A pitch that's merely a loud out at sea level becomes an extra-base hit in Denver. His off-speed arsenal (changeup, curveball) runs negative run value — those pitches are genuinely good. The question is whether he abandons the fastball in his first start in a new uniform.

On the other side, Gabriel Hughes is one of the best-kept secrets in the Rockies' rotation. His xERA at home this year is 2.33, and his barrel rate is 2.9% — almost zero. He limits hard contact at altitude in a way the ERA (3.33) undersells. For the Rays, Junior Caminero brings both of his issues to Coors tonight: a −15 Outs Above Average at third base (second-worst in baseball) and a first start in a park that doesn't forgive errors on double plays. The total is already 11.0. The defense is already in the conversation.