It's shaping up to be another exciting day at the US Open, after drama-filled first week.
Nick Kyrgios has become a top pick for number one after taking out reigning champion Daniil Medvedev for a spot in the quarter finals.
The Australian was characteristically volatile on court, making a bizarre foul shot in the third set.
Ajla Tomljanovic surged into the quarter finals, following up her win over Serena Williams with a with a straight-sets victory over Russian Ludmilla Samsonova.
Tennis correspondent David Luddy spoke to Susie Ferguson.
