Filipino Olympian Eumir Marcial recovered from three knockdowns to score a dramatic fourth-round technical knockout win over a game American Isiah Hart Sunday morning (Manila time) at Virgins Hotel in Las Vegas, Nevada. Fighting for the first time since claiming a bronze medal at the Tokyo Olympics in July of last year, Marcial started the fight seemingly measuring the skill of his lanky foe when he got tagged with a quick counter right that sent the Zamboangeño falling flat on his back. The 26-year-old Marcial, though, got up quickly from the knockdown and immediately stepped on the gas pedal…