The signing of Corbin - who had drawn interest from the New York Yankees and Philadelphia Phillies, among other clubs, and was expected to draw offers of at least $20 million a year - could be a signal that the Nationals are moving on from Harper. He was considered the top starter available in an elite free-agent class that includes right fielder Bryce Harper, the 2012 NL Rookie of the Year and 2015 NL MVP for the Nationals.
Corbin, 29, will nearly certainly get the most lucrative contract of any available pitcher.
Happ last pitched for the Yankees, getting sent to The Bronx ahead of the trade deadline from the Toronto Blue Jays.More news: Wrexham draw Leicester in FA Cup third round
NY looked like the favorite to sign Corbin when the offseason began because the pitcher grew up in NY and is from a family of Yankee fans. The deal will be for six seasons, keeping Corbin in a Nationals uniform through the 2025 season.
By Corbin's second season, he'd reached All-Star status, going 14-8 in 32 starts with a 3.41 ERA and 1.17 WHIP. Corbin's decision will keep him out of the unsafe American League East and he will stay in the more comfortable NL, with plenty of other arms around him. The Phillies telling Corbin they won't be out-bid isn't surprising, especially after owner John Middleton's remarks to Nightengale in which he said they expect to be a "little stupid" about how they spend their money.
Corbin, who has played his entire major league career for the Arizona Diamondbacks, joins a rotation in Washington that already includes three-time Cy Young Award victor Max Scherzer and Stephen Strasburg.
Per MLB.com's Jamal Collier, Corbin's deal with worth six years and $140 million.