FORT MYERS, Fla. — Mike Napoli started a seven-run fourth inning with a broken-bat homer and Justin Masterson allowed one run in 5 2/3 innings as the Boston Red Sox rolled to a 14-2 victory over the Minnesota Twins on Monday night.

Napoli had his bat sawed off on an inside pitch from Brian Duensing. The Red Sox went on to score six more times in the inning off Duensing.

Twins reliever Blaine Boyer made an emergency start and pitched 1 2/3 innings in place of Kyle Gibson, who had the flu.

Boyer was added to the Twins’ 40-man roster, saving a spot for him in their bullpen for the regular season.

The 33-year-old Boyer pitched in parts of eight major league seasons with five teams, most recently for San Diego. Boyer had a 3.57 ERA in 32 appearances last year for the Padres, and the Twins signed him during the offseason to a minor league contract.

Boyer, who was out of baseball in 2012, has a 1.69 ERA with one walk and five strikeouts in 10 2-3 innings this spring.

He gets a $750,000 salary while in the major leagues and $100,000 while in the minors. He can earn $100,000 in performance bonuses: $25,000 each for 35, 40, 45 and 50 games as a pitcher.