BOSTON — The Red Sox today signed 2018 MLB Draft first-round selection Triston Casas, an 18-year-old third baseman out of American Heritage High School in Plantation, Fla.

Casas was expected to agree on a contract for the full slot value of the 26th overall pick — $2,552,800, a source tells MLB.com.

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BOSTON — The Red Sox today signed 2018 MLB Draft first-round selection Triston Casas, an 18-year-old third baseman out of American Heritage High School in Plantation, Fla.

Casas was expected to agree on a contract for the full slot value of the 26th overall pick — $2,552,800, a source tells MLB.com.

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The club also reached agreements with seven additional draft selections: right-handed pitcher Durbin Feltman (3rd round), outfielder Devlin Granberg (6th round), second baseman Jarren Duran (7th round), left-handed pitcher Brian Brown (9th round), second baseman Grant Williams (10th round), right-handed pitcher Andrew Politi (15th round), and second baseman Jonathan Ortega (19th round).

Casas, who was the 26th overall selection in the Draft, will report to the rookie-level Gulf Coast League Red Sox. The other seven signees will report to Short-A Lowell.

Casas, 18, played 29 games for American Heritage this season, batting .385 (30-for-78) with a .545 on-base percentage, an .884 slugging percentage, seven home runs, six doubles, six triples, 31 runs scored, and 35 RBI. A three-time gold medalist with USA Baseball, Casas was given the organization’s 2017 Richard W. “Dick” Case Award, presented annually to the program’s top player. He led the national U-18 team to its fourth consecutive world championship title in 2017, earning tournament MVP honors with three home runs and 13 RBI, both leading the tournament field.