J.D. Martinez was unable to break down his swing via video last year, leading to his worst year in the majors.

Garrett Whitlock, picked up from the Yankees in the Rule 5 draft, will need to stay on the 26-man roster – or injured reserve – for Boston to retain his rights.

Boston certainly has more depth this season, but will the top-line pitchers be able to stay healthy and stay on the field?

Xander Bogaerts enters his eighth full season in the big leagues in the middle of his physical prime and as a key piece if Boston hopes to return to the postseason.

The team’s chief baseball officer, Chaim Bloom, says the season will be a success if he sees a strong foundation by the end of the year.

The left-handed starter missed last season after a bout with COVID-19 and myocarditis.

Boston’s ace said he also tested positive for COVID-19 in January but did not suffer some of the worst symptoms.

Alex Cora has constructed a team with plenty of flexibility, and new players like Kiké Hernandez and Marwin Gonzalez are fitting right into his plans.

Outfielder Franchy Cordero figures to be the only player of the five the Red Sox will receive who will make an impact in 2021.