If we were hoping for a free agency surprise this Major League Baseball offseason, we certainly got one.

Weeks of rumors. Predictions. Reported contract demands. And you'd be hard-pressed to find a single thing linking Corbin Burnes to the Arizona Diamondbacks.

That is, of course, until Burnes became a Diamondback out of thin air.

Early Saturday morning on the East Coast, news broke that the four-time All-Star Burnes had agreed to a six-year, $210 million contract with the Diamondbacks, giving Arizona a new ace and one of the filthiest starting rotations in all of baseball.

Jon Heyman of the New York Post was the first to report the news. Burnes will also have an opt-out after two years, enabling him to test the free-agent market again if he so chooses.

Burnes, 30, is a four-time All-Star, a 2021 Cy Young Award winner, and one of the true workhorses in MLB these days. He's made 125 starts over the last four seasons, posting a 2.94 ERA and 10.2 strikeouts per nine innings over that stretch.

Burnes was reportedly seeking a $245 million contract, but settled for a higher average annual value over fewer years. The deal tops the previous high-water mark for a Diamondbacks contract, set by Zack Greinke's $206.5 million deal in 2017.

Of course, Arizona got two-and-a-half good years out of Greinke, then traded him to the Houston Astros at the right time, before his stuff started to tail off. Ideally, things will work out even better with Burnes.

The opt-out means Burnes may isn't exactly guaranteed to wear a Diamondbacks cap in Cooperstown someday, but if things work out perfectly, that still may end up happening. In the meantime, he makes them a much scarier threat in the loaded National League West.