BOSTON — Justin Masterson made his big-league debut yesterday.

Great things are predicted for the 6-foot-6, 250-pound right-hander. The 23-year-old certainly seems to have all the tools for stardom: size, live arm and intelligence, to name three.

Here are some first-game impressions:

•His motion is three-quarters. The beginning of his motion is deliberate, but then he explodes off the rubber, slinging the ball to the plate, reminiscent of the finish to Hall of Famer Dennis Eckersley’s delivery. His delivery, though, does seem to put a lot of stress on his elbow.

•He works very quickly, a sign of an extremely confident pitcher, not the typical first-game-in-the-bigs body language. Masterson was by no means wide-eyed, in awe of his surroundings. He looked like he belonged.

•He can field his position. Masterson quickly came off the mound when speedy Chone Figgins attempted to bunt for a hit in the third. Under control, Masterson raced in, picked up the ball, planted his feet, squared up to first and threw a strike for the out.

•He looks like he can control the opposition’s running game. He used his normal high leg-kick delivery in the second and the Angels’ Maicer Izturis swiped second without a throw. The next time the Angels had a runner at first, Masterson used the slide-step. And he showed quick feet and a good move to first, almost picking off Gary Matthews Jr. in the third.

•He has the stuff to compete at the big-league level. Masterson was able to keep the Angels off balance with his fastball (up to 92 mph), changeup (80-84) and slider (78-80), but his bread and butter was the sinker, generally 87-90. Of the 18 outs he recorded, 11 came on ground balls and he also whiffed four, so there were only three balls hit into the outfield for outs.

skrasner@projo.com