BOSTON — AL MVP Mookie Betts and the World Series champion Boston Red Sox agreed to a $20 million, one-year contract, a raise of $9.5 million that was for a few hours the highest for an arbitration-eligible player. Betts was surpassed later Friday by New York Mets pitcher Jacob deGrom, who got a raise from $7.4 million to $17 million. The Red Sox reached deals with all nine players eligible for arbitration ahead of Friday’s scheduled swap of salary figures.