Thomas Pieters of Illinois beat Max Homa with a par on the 20th hole to give Illinois a 3-2 victory over top-seeded Cal on Saturday in the NCAA golf semifinals in Milton, Ga.
Homa, the tournament individual winner Thursday, three-putted for a bogey on the second extra hole.
Top-ranked Cal lost after setting an NCAA season record with 11 victories in its last 13 tournaments. The Golden Bears had all five of their starters ranked among the top 25 in the nation.
Michael Weaver and Brandon Hagy produced Cal's two wins. Weaver edged Thomas Detry 1 up, and Hagy beat Alex Burge 4 and 3. Illinois' Charlie Danielson beat Joel Stalter 3 and 2, and Brian Campbell topped Michael Kim 2 and 1.
"It's hard to believe it's over," Cal coach Steve Desimone said. "To have a season like this, I just don't know the next time a season like this is going to happen."
The 15th-seeded Illini will face No. 2 Alabama in the final Sunday. The Crimson Tide beat host Georgia Tech 3-0-2 on the Capital City Club's Crabapple Course.
Alabama lost to Texas last year in the title match.
Stanford finished fourth in its semifinal and will race in Sunday's Petite Final.
Unusual Way, the 4-5 favorite ridden by Russell Baze, posted an impressive front-running victory in the $100,000 Campanile Stakes at Golden Gate Fields. Making her turf debut, Unusual Way won the one-mile race for California-bred 3-year-old fillies by 21/4 lengths over stretch-running Qiaona in 1:36.81.
Wire services contributed to this report.