It’s all chalk on the San Antonio River Walk.

Four No. 1 seeds advanced to the Final Four for the first time since 2008, when Mario Chalmers’s heroics late in regulation helped deliver Kansas a memorable championship game overtime win vs. Memphis.

This year’s crop of teams features the four-best teams in the country — by a wide margin — according to Ken Pomeroy and ensures one coach will win his first national title.

At the start of March Madness, predictive analytics experts Dimers said Duke had a 27.1% chance to win the NCAA championship.

Dimers also said Florida had a 69.7% chance to reach the Final Four. And Auburn and Houston have the third- and fourth-highest championship probability odds, behind Duke and Florida, according to Dimers.

The national semifinals are scheduled to be played Saturday night at the Alamodome in San Antonio, where Florida-Auburn will tip off at 6:09 p.m. Duke-Houston is scheduled to tip at 8:49 p.m. Both semifinals will air on CBS.

The winners will face off in the national championship game Monday night.

STREAM: Every NCAA Tournament game on DirecTV Stream (free trial)

Here’s a look at the updated bracket:

Saturday’s Final Four TV schedule

(1) Florida vs. (1) Auburn, 6:09 p.m | CBS

(1) Duke vs. (1) Houston, 8:49 p.m. | CBS

Sunday’s Elite Eight scores

(1) Houston 69, (2) Tennessee 50

(1) Auburn 70, (2) Michigan State 64