CANCUN, Mexico -- It's the upperclassmen who know Wisconsin coach Bo Ryan's system best.

Their experience showed Tuesday as the No. 10 Badgers blunted a Saint Louis surge to win 63-57 and advance to face West Virginia in Wednesday's finals of the Cancun Challenge.

Four juniors figured prominently in the win that has kicked undefeated Wisconsin (7-0) off to its best start of the Ryan era. The Badgers have not opened the season with seven consecutive wins since starting 11-0 in 1993-94.

"The upperclassmen have done a great job of passing on the system so to speak," Ryan said Tuesday.

Junior Traevon Jackson scored 16 points and Frank Kaminsky added 12 Tuesday in a game that saw the Badgers execute Ryan's trademark disciplined defense and heads-up offense.

Some stellar individual performances helped, too.

Kaminsky grabbed eight rebounds and had four blocks that helped the unbeaten Badgers (7-0) to a 20-15 halftime lead. Jackson stepped up to help squash a second-half run by Saint Louis (5-1) that made it a 5-point game with 1:10 to play.

Rob Loe led the reigning Atlantic 10 Conference champion Billikens with 15 points, Austin McBroom had 14 and Dwayne Evans added 12.

Blocked shots and early fouls by Saint Louis were factors in the first half, where the lead changed hands five times until Kaminsky blocked McBroom's layup attempt and Bronson Koenig made a 3-pointer to give the Badgers a 20-15 lead. Kaminsky had four of the Badgers' seven blocks in the period.

The 7-foot-tall Kaminsky also drew Saint Louis' 10th team foul of the period, putting Wisconsin in the double bonus, and the Badgers converted five free throws in the final three minutes. Saint Louis finished with 25 personal fouls to 17 for Wisconsin.

The Billikens tried to rally on a layup and dunk by Loe, but Wisconsin juniors Josh Gasser and Duje Dukan responded with layups of their own to make it 31-23 at the half. Saint Louis shot 31.3 percent from the field in the period compared with Wisconsin's 47.6 percent.

Wisconsin opened the second half on a 6-2 run that included two layups by Kaminsky, forcing a Saint Louis timeout, then shot five more unanswered points for a 40-25 lead, their largest of the game.

But then Evans, benched in the first period after committing three fouls, re-entered the game and recharged the Saint Louis offense, driving into the paint and drawing fouls to score four free throws and a layup in a little over a minute to make it a 10-point game at 9:56.

Jordair Jett scored a jumper, then had a chance to make it a 6-point game, but missed the free throws and Wisconsin withstood the Saint Louis burst, extending their lead to 50-38 with 5:16 to play on a layup by Sam Dekker and a Kaminsky jumper.

But Saint Louis rallied again, with Dekker accidentally tipping in a shot by Evans, and Loe hitting a jumper and a free throw to make 5-point game with 1:10 to go. But the Billikens turned it over and Jackson hit two free throws to make it 58-51. Loe and McBroom hit back-to-back 3-pointers for Saint Louis, but the Badgers held off the run, with Jackson scoring 10 points in the final 3 minutes.

Jackson led all scorers with 7 free throws on 7-of-10 shooting. Kaminsky scored a Wisconsin single-game record 43 points against North Dakota on Nov. 19 and ranks among the Big Ten Conference's top 10 in scoring, averaging 17.3 points per game.

Wisconsin beat Oral Roberts 76-67 Saturday and Saint Louis beat Bowling Green 74-47 to advance to the semifinals.