Mariners just crushed the Cubs' plans with bold Eugenio Suárez trade

St. Louis Cardinals v Arizona Diamondbacks | Norm Hall/GettyImagesEugenio Suárez returned to the Arizona Diamondbacks' starting lineup on Wednesday after an injury scare on Monday night, and that felt like it was going to be his last time with the Diamondbacks. Suárez was the top rental bat available, and the belief was that the Chicago Cubs and Seattle Mariners were the most aggressive teams in pursuit of the All-Star third baseman. In the middle of the night, heading into the day of the deadline, the Mariners swooped in and completed a trade with the Diamondbacks.

The particulars saw the Mariners send first base prospect Tyler Locklear as the centerpiece of their package to Arizona, adding…