President of Baseball Operations David Dombrowski made the announcement.
Cuevas, 25, made his major league debut on April 21 against the Tampa Bay Rays and was charged with the loss in his lone appearance with the Red Sox, allowing two runs on three hits in 2.1 innings of relief. The Venezuelan native has also pitched in 12 games (all starts) with Pawtucket this season, going 4-3 with a 3.30 ERA (27 ER/73.2 IP), 48 strikeouts, and a .235 opponent batting average. A non-roster invitee to Red Sox spring training this year, Cuevas was originally signed by Boston as an international free agent on July 2, 2008. In 149 career minor league appearances (88 starts)—all in the Red Sox organization—he is 42-33 with six saves and a 3.50 ERA (261 ER/671.0 IP).
Marrero, 25, has made one start and played in four games in his only stint with the Red Sox this season, going 1-for-7 and appearing defensively at third base. The Miami native has also made 58 starts for the PawSox this year at shortstop (54 games), second base (two games), and third base (two games), hitting .216 (49-for-227) with nine doubles, one triple, and 17 RBI. Selected by the Red Sox as the 24th overall pick of the 2012 June Draft, Marrero made his major league debut in 2015, playing 25 games (12 starts) over three stints with Boston. In 446 career minor league games, he has hit .252 (430-for-1,706) with 86 doubles, 16 home runs, 157 RBI, and 84 stolen bases.
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