He impressed there, leading all junior-aged scorers with 17 points (nine goals, eight assists), in 24 games.
The quick success didn't surprise those familiar with him and his game.
"Just look at his shot," said St. Louis Blues forward Dmitrij Jaskin, a Czech Republic teammate. "It's amazing. He can dance through four people. It's really hard to read him. He's so quick with his size and his speed. It's just great. He's 19. It's amazing how he plays. It's a lot of fun to watch him.
"I think if he puts some weight on and gets a little stronger, he can be there, for sure."
It might be the only area the 6-foot-1, 168-pounder has to improve to make a successful jump, suggested Toronto Maple Leafs center Tomas Plekanec.
"He's quite a talent," said Plekanec, also a teammate of Necas at the World Championship. "He's great. He's a good player. From what I've seen he's a great skater. He's a tall guy. He has to get a little bit stronger and a little better.
"He's going to adjust to that very easily, I'm sure. He's a good player."
His development has come together quickly.
"Basically in the last two years," said Jiri Fischer, general manager for the Czech Republic and a veteran of 305 NHL games from 1999-2006 as a defenseman with the Detroit Red Wings. "He's certainly one of the most improved players in Central Europe. That's across the board.
"He wants to play. He wants the puck. He wants to skate. He wants to make things happen. And he's not afraid to make things happen. Many young players, they get into an environment that could be intimidating ��� it could be the national team or the NHL, and they become a little hesitant and they're in different roles than they're used to because generally the young stars, potential players, they grow up playing with the puck and all of a sudden they're in much more competitive teams with a lot more depth of talent, and their role changes. For Martin, he's been outstanding."