Malachi Flynn scored 21 points to lead No. 4 San Diego State to a 71-67 victory over UNLV.
The Aztecs staved off UNLV's second-half rally to remain the only unbeaten team in the country while breaking the school record for best start in the program's 99 seasons.
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San Diego State's 21st consecutive victory beaks the school record of 20 straight wins that was set during the 2010-11 season and matched by the 2013-14 squad that made the Sweet 16 of the NCAA Tournament.
Bryce Hamilton scored 29 points for UNLV.