Men's second seed Rafael Nadal has been knocked out of the U.S. open in the fourth round by a hard charging Francis tiafoe The American 49 winners including 18 aces on his way to his first quarterfinal New York securing the three hour and 34 minute battle 6 three in the fourth the men's championship is now wide open In women's action Jessica bagula reached her first U.S. I've been caught after straight setting Petra kvitova that the next face the top seed iges fun tech Bad news over fellow American Daniel Collins She lost in three to irina sabalenka I'm Graham agar's