Happ asked for a raise from $624,000 to $4.1 million during a Zoom session Thursday, Feb. 18, 2021, and the Cubs argued he should be paid $3.25 million.
Teams finished with a 5-4 advantage in cases that went to a hearing, their second straight winning record after two consecutive years in which players had an advantage.
A day after hearing arguments, arbitrators Frederic Horowitz, Steven Wolf and Jules Bloch decided in favor of Happ's figure rather than the team's $3.25 million.
St. Louis pitcher Jack Flaherty ($3.9 million), Braves pitcher Mike Soroka ($2.8 million) and Rays first baseman Ji-Man Choi ($2.45 million) also won their cases.
Teams beat Atlanta shortstop Dansby Swanson ($6 million), San Francisco infielder Donovan Solano ($3.25 million), Tampa Bay pitcher Ryan Yarbrough ($2.3 million), New York Mets third baseman/outfielder J.D.