Gervonta Davis knocks out Rolando Romero in round 6 with a left hand on Saturday night for their world lightweight bout at the Barclays Center in Brooklyn. Davis remained undefeated and improved his record to 27-0-0, with 25 KO's.GOODNIGHT BROOKLYN 😴@Gervontaa KOs Romero in round 6 with a POWER left hand 😳#DavisRomero...