Led by quarterfinalists Seth Gross and Luke Zilverberg, six South Dakota State University wrestlers advanced to the second day of competition at the NCAA Division I Wrestling Championships Thursday.

The national runner-up at 133 pounds a year ago, Gross won both his matches Thursday by major decision.

Zilverberg, a senior from Belle Plaine, Minnesota, who was making his second consecutive appearance at nationals, pulled off an upset in the 157-pound Round of 16 during Thursday’s evening session. Facing fourth-seeded Josh Shields of Arizona State, to whom he had lost a pair of 4-0 decisions earlier in the season, the 13th-seeded Zilverberg moved on to the quarterfinals with a 9-6 decision.

Two other Jackrabbit wrestlers lost in the Round of 16 Thursday night after winning opening-round matches, at 174 pounds 11th-seeded David Kocer and eighth seeded Nate Rotert at 197.

Staying alive in Thursday night’s wrestlebacks were 125-pounder Connor Brown and 141-pounder Henry Pohlmeyer.