2009-10: Ryan Tesink played in 44 games for the Woodstock Slammers of the MJAHL. He scored 10 goals and added 19 assists for 29 points to go along with 96 penalty minutes. In 14 playoff games, Tesink scored 4 goals and added 6 assists for 10 points. Tesink played for Team Atlantic at the 2010 World U-17 Hockey Challenge, scoring 2 goals and adding 4 assists for 6 points in 5 games. Tesink was chosen in the first round, 18th overall, of the 2010 QMJHL Entry Draft by the Saint John Sea Dogs.
2010-11: In his QMJHL rookie season, Tesink played in 59 games for the Saint John Sea Dogs. He scored 8 goals and added 27 assists for 35 points. In 19 playoff games, Tesink scored 3 goals and added 2 assists for 5 points. Tesink scored 1 goal in 4 Memorial Cup games.
2011-12: Limited to 36 games during the regular season due to knee problems, Tesink proved to be a valuable third line forward for the powerful Saint John Sea Dogs in the post-season. He scored 13 goals with 27 assists and was plus-23 with 54 penalty minutes during the regular season. In the Quebec League playoffs he scored 7 goals with 6 assists in 17 games and was plus-5 with 24 penalty minutes as Saint John won the QMJHL championship. While he was a forgettable minus-3 in the Sea Dogs’ 7-4 loss to QMJHL rival Shawinigan in the Memorial Cup semifinal, he scored three goals in four games at the tournament.
2012-13: Tesink began the season as an assistant captain for Saint John before a mid-season trade to Blainville-Boisbriand. At the time of the trade, he had 16 goals with 21 assists and was plus-3 with 75 penalty minutes in 35 games for the Sea Dogs. A chronic knee condition allowed him to play just six regular season games for the Armada (leading to a league hearing on the trade). He scored 1 goal with 3 assists and was plus-3 with 6 penalty minutes. Blainville-Boisbriand finished first in the West Division and reached the playoff semifinals. In four playoff games Tesink scored 1 goal and was minus-3 with 23 penalty minutes. He signed a three-year entry-level contract with St. Louis in March, 2013.
Tesink is used as an energy-line type who can fill a larger role when called upon to do so. He is only average sized but keeps his feet moving and plays with an edge. Tesink is a strong skater who dedicates himself equally to both ends of the ice. He's a tireless forechecker who will take a hit or a stick in the guts to make a play.
Tesink attended training camp with the Blues before being assigned to the ECHL's Alaska Aces to start the 2014-15 season. In the first year of his pro career, he has gotten off to a slow start offensively for the Aces but has garnered some attention with his physical play. A bit of a lightning rod and a consistent scorer playing on a powerful Saint John's team in the early days of his junior career, St. Louis took a late round flier on him in the 2011 NHL Draft. Knee injuries and some drama have hampered his development and it appears he will spend much, if not all, of his original three-year entry-level contract at the minor league level. Long-term he projects as an energy-type, lower line forward capable of creating chaos and occasionally contributing on the scoresheet.