2009-10: Tomas Hertl skated for the Slavia Prague U18 and U20 teams in the Czech Republic, winning a gold medal with the U18 squad. Hertl was the third-leading scorer for the U20 team as a 17-year-old, scoring 12 goals with 26 assists and 12 penalty minutes. He had 1 goal with 2 penalty minutes in four playoff games. Hertl was dominant at the U18 level – scoring 13 goals with 10 assists in seven regular season games and then adding 5 goals with 6 assists in five playoff contests.
2010-11: Hertl appeared in one game for Slavia Prague in the Czech Extraliga, was was one of four players with 40 or more points on a high scoring Slavia U20 team, and represented the Czech Republic at the 2011 U18 World Junior Championship. Hertl scored 14 goals with 27 assists and had 49 penalty minutes in 33 games for Slavia U20. In four playoff games he scored 4 goals with 2 assists. In six games at the U18 WJC he scored 1 goal and was minus-three with 12 penalty minutes. The Czech Republic finished eighth in the tournament.
2011-12: Hertl was the fourth-leading scorer for Slavia Prague as a rookie in the Czech Extraliga and represented the Czech Republic at the 2012 U20 World Junior Championship. Skating in 38 games, he scored 11 goals with 15 assists and had 22 penalty minutes. After finishing 12th in the 14-team league, Slavia avoided relegation to the first division in the twelve-game playout series. Hertl scored 3 goals with 6 penalty minutes in the post-season. In six games at the WJC, he scored 3 goals with 2 assists and was plus-two. The Czechs finished fifth in the tournament. Hertl was ranked fifth amongst European skaters in Central Scouting's final rankings prior to the 2012 NHL Draft.
2012-13: Hertl played for Slavia Prague in the Czech Extraliga and represented the Czech Republic in the 2013 IIHF World Championship and World Junior Championship tournaments. Slavia's leading scorer, he had 18 goals with 12 assists in 43 games and was +5 with 16 penalty minutes. The club finished first in the Extraliga before falling to third-place Plzen in the playoff semifinals. Hertl scored 3 goals with 5 assists and was an even plus/minus in 11 playoff games. In eight games at the World Championship he was -3 with no points nor penalty minutes. Hertl was an assistant captain for the Czech Republic at the WJC and scored 2 goals with 3 assists; finishing with an even plus/minus and 10 penalty minutes. He signed a three-year entry-level contract with San Jose in May, 2013.
Tomas Hertl is a young star on the rise. He excels in almost every skill and situation and works tirelessly at correcting the faults he does have. He is a good skater, and travels quick to the puck with above average four-step acceleration. The playmaking Czech has a very under-appreciated physical game that allows him to impact games outside of the score sheet. He might not possess top level point production skills, but his all-around game, highlighted by his excellent shot, make him not just a potential top line forward, but a potential star in the NHL.
Hertl seems destined to start the year with the big club. Having bought him out of his foreign deal, the Sharks will give every opportunity for Hertl to adapt to the North American game on the fly. With a solid camp, he could find himself in an immediate top-six role. Despite a strong group of rookies likely to enter the NHL this season, Hertl should be considered a serious player for the Calder Trophy award.