NATIONAL HARBOR, Md. – The difference was striking.



When Mickey Moniak arrived in Philadelphia to sign his first professional contract six months ago, he was rail-thin and 170 pounds.



On Tuesday night, Moniak made a quick visit to the winter meetings to be honored as Baseball America’s high school player of the year for 2016.



He’d added 20 pounds to his 6-foot-2 frame.



“It’s all muscle,” Moniak said proudly.



The Phillies selected Moniak with the first pick in the June draft and signed him for $6.1 million. Just a few months of professional baseball convinced the 18-year-old centerfielder that he needed to get stronger. He recently capped off his first year of pro ball with a three-week stint at the Phillies’ strength and conditioning camp in Clearwater.



“It’s something the Phillies wanted me to do and I knew I definitely needed it, too,” Moniak said. “I really enjoyed my first year. I got a taste of what it was like to play baseball for a job and it was a good time.



“There were a lot of positives that came out of the first year. I felt like I jumped in there and really competed. I hit well in July. In August, I started to fatigue and I wasn’t prepared for that, being my first season. But it was a good learning experience. I needed to get stronger.”



Moniak hit .284 with a .340 on-base percentage, 11 doubles, four triples, a homer and 28 RBIs in 46 games for the Phillies’ prospect-stacked Gulf Coast League team. That club, loaded with young Latin players and first-year talent from the 2016 draft, went 41-17 and advanced to the finals of the league playoffs before losing to the Cardinals.



After the playoffs, many of the players from that club participated in the Florida instructional league. Moniak played sparingly, however, after dealing with some soreness in his right hip. He was checked out by doctors in Philadelphia and there are no more concerns.



“It was just tightness,” Moniak said. “Everything is good. I’m 100 percent. They said it was either a growing pain or just tightness. I just have to stretch more.”



Moniak is an athletic centerfielder with speed and a good left-side bat. He has been compared favorably to former All-Star Steve Finley.



"Collectively, we believe Mickey was the best player available in the draft," Johnny Almaraz, the Phillies head of amateur scouting, said on draft night in June. "He's a true centerfielder with incredible offensive ability and the potential to be a perennial All-Star."

Moniak hit .476 with seven homers, 12 triples and four doubles at La Costa Canyon High School in Carlsbad, California, during his senior season. He impressed a rival scout who saw him play five times during the season.

“The bat is good,” the scout said. “He’s going to hit and hit for average. He’s a good centerfielder. He can run. The question is how many home runs will he hit? If he ends up getting stronger, he could be a corner bat that’s unbelievable. There’s no negative here. It’s a good pick.”



Now, Moniak is stronger. He looked sturdy in a dress shirt and tie at the winter meetings Tuesday night. He is eager to see how it all translates on the field in 2017.



“I’m excited for the season,” he said. “I’m just going to go to spring training and compete and hopefully end up in (Single A) Lakewood, stay healthy and hopefully have a winning season and win a championship. That’s the ultimate goal and if personal stats come with that, too, that’s great.”