O'Connor is the newest member with the Avalanche organization, as he signed a two-year, entry-level contract on July 23 after attending the team's development camp as an invite.
He played the previous three seasons at the University of Denver, tallying 43 points (16 goals and 27 assists) in 108 total contests. He had a career-high 21 points (seven goals and 14 assists) in 41 games with the DU Pioneers during his junior campaign in 2017-18, a year after helping the school win the national championship.
Boikov's Return: Defenseman Sergei Boikov played in his first game in nearly a year on Saturday.
Boikov hurt his shoulder in a Colorado preseason game on Sept. 21, 2017 against the Dallas Stars and had season-ending surgery, with the rehab costing him the entire 2017-18 campaign.
Even though Saturday's contest was just a rookie tournament game, Boikov was still looking forward to getting back on the ice and competing with his teammates.
"It's very exciting because the whole time I wasn't playing, I was thinking about going on the ice and help the guys and help the team," he said.
Captains:Gabriel Landeskog hasn't lost his job as team captain of the Avalanche, but the organization is designating three captains for its prospect games in Vegas.
Vladislav Kamenev, the only player with NHL experience (five games), donned the 'C' as captain of the rookies, while Beaudin and Nicolas Meloche were named alternates. All three players had the captains letters on their jerseys during the contest.
Kamenev has played in 149 total pro games in North America with the Nashville Predators and Avalanche organizations. Beaudin and Meloche are both at their third rookie tournament with Colorado and just wrapped up their first professional campaigns at the minor-league level.
Rookie Experience: The Avs had 13 players make their rookie tournament debut for the club on Saturday.
Among the first-timers were three 2018 draft picks: forwards Martin Kaut and Brandon Saigeon and goaltender Justus Annunen.
Netminder Petr Kvaca and Lewis were both playing in their second straight tournament, while Josh Anderson, Travis Barron, Beaudin, Boikov and Meloche were at their third rookie event.
What's Next: Colorado has a quick turnaround as it will play the second half of a back-to-back set on Sunday versus the Anaheim Ducks.
The contest begins at 6 p.m. MT, and it will be streamed live online at ColoradoAvalanche.com (blackouts apply).
Monday is reserved as a practice day for all six teams at the Vegas Rookie Faceoff before the showcase concludes with three matinees on Tuesday.