Lamont Butler scored a buzzer-beating game-winner to send San Diego State into the National Championship Game where they will face Connecticut after edging Florida Atlantic 72-71 on Saturday.

Butler got downhill and hit a 17-foot two-point shot as time expired completing a remarkable 14-point second-half comeback for the Aztecs.

It was the first buzzer-beater during this NCAA tournament and only the fifth in the Final Four history.

Aztecs coach Brian Dutcher opted against calling a timeout when Nathan Mensah rebounded Johnell Davis' missed jumper with the Owls leading 71-70 with 10 seconds left, before Butler drove on and took responsibility with his buzzer-beater for the ages.

"I didn't really know how big it was," Butler said who was mobbed by teammates and coaches. "We're going to the national championship. That's not things many people do."

After trailing 40-33 at half-time, SDSU found its defensive grip to work its way back into the contest, with Matt Bradley scoring 21 points with six rebounds.

Alijah Martin top scored for FAU with 26 points including three triples along with seven rebounds.

The Aztecs will face UConn who accounted for the Miami Hurricanes 72-59 with forward Adama Sanogo outstanding with 21 points including two three-pointers and 10 rebounds.

UConn advanced to their fifth National Championship game, with the Huskies having not lost to a non-conference opponent this year and winning all five NCAA games by double digits.

Huskies guard Jordan Hawkins overcame illness to contribute 13 points, while Miami's Isaiah Wong scored a team-high 15 points on four-of-10 shooting with their offense blunted, going at 32.3 per cent from the field as a team.