Frederick infielder Nick Delmonico, who was rated by Baseball America before the season as the organization’s No. 4 prospect, was struck in the helmet with a pitch Wednesday.

He left the game and was held out of Thursday’s contest with the Salem Red Sox for precautionary reasons. The Orioles do not believe the 21-year-old Delmonico has a concussion. Delmonico was hitting .254 with a .361 on-base percentage and 13 homers in 56 games for the Keys.

Delmonico was beaned by one of the Red Sox top prospects, lefty Henry Owens, who along with two other Salem pitchers, threw a nine-inning no-hitter against the Keys on Wednesday.

In other minor league news, left-hander Stephen Tarpley, whom the Orioles selected in the third round of this June’s draft, made his pro debut Thursday with the Gulf Coast League Orioles. Tarpley threw one inning – by design – and did not allow a baserunner. He struck out one batter and induced two groundouts.

Infielder Jonathan Schoop, the organization’s top position player who is with the GCL Orioles while rehabbing a stress fracture in his back, homered in Thursday’s game. 

The Orioles’ top pick this year, right-hander Hunter Harvey, will make his pro debut for the GCL Orioles on Friday.

One more all-star note: The Orioles had three players selected for the Dominican Summer League All-Star Game, which will be held Sunday.

They are:

Center fielder Alexander Mercedes, 21, from the Dominican. He has a .347/.399/.507 slash line with 13 doubles and five triples.

Right-hander Rafael Moreno, 18, from Brazil. He is 4-1 with a 1.24 ERA in eight starts. He’s allowed 37 hits and 10 walks while striking out 31 batters in 43 2/3 innings.
    
Right-hander Francisco Jimenez, 18, from the Dominican. He is 3-3 with a 1.80 ERA in eight starts. He has allowed 28 hits and 15 walks while fanning 39 in 40 innings pitched.

Also, DSL Orioles No. 1 manager Elbis Morel has been named a coach for the All-Star Game.