Hirokazu Sawamura #19 May 29, 2021 Miami Marlins at Boston Red Sox

Boston Red Sox warning signs to look for during 2021 season

Hirokazu Sawamura tosses scoreless ninth inning in Red Sox debut; 'For him to go out there and get his feet wet at the big-league level, that was fun to watch,' Alex Cora

Boston Red Sox relief pitcher Hirokazu Sawamura (19) throws during the third inning of a baseball game against the New York Yankees at Fenway Park, Friday, Sept. 24, 2021, in Boston. (AP

Hirokazu Sawamura of the Boston Red Sox reacts after a strikeout in News Photo - Getty Images

Hirokazu Sawamura of the Boston Red Sox reacts after a strikeout in News Photo - Getty Images

Hirokazu Sawamura: Breaking News, Rumors & Highlights

WAGERTALK MEDIA 2023 MLB BETTING GUIDE

Hirokazu Sawamura: Breaking News, Rumors & Highlights

Hirokazu Sawamura of the Boston Red Sox reacts after a strikeout in News Photo - Getty Images

Ex-Red Sox Pitcher Reportedly Agrees To Deal With Japanese Club After Surprisingly Short Stint - Sports Illustrated Inside The Red Sox

Hirokazu Sawamura - Boston Red Sox Relief Pitcher - ESPN

Hirokazu Sawamura #19 May 29, 2021 Miami Marlins at Boston Red Sox Game Used Home Alternate Jersey, 1/3 Inning Pitched, Strikeout, Size 48

Hirokazu Sawamura of the Boston Red Sox reacts after a strikeout in News Photo - Getty Images

Red Sox pitcher Hirokazu Sawamura tests positive for COVID-19