Image:Teenager Marta Kostyuk is the youngest player to reach a Grand Slam third round since Mirjana Lucic-Baroni at the 1997 US Open
Image:Kyle Edmund, who overcame US Open finalist Kevin Anderson two days ago, beat Denis Istomin to reach the third round
Image:Caroline Wozniacki roared back from 5-1 down in the final set, saving two match points, to edge Croatian Jana Fett
Image:Fourth seed Elina Svitolina came from a set down to defeat Czech Katerina Siniakova
Image:Former Australian Open finalist Jo-Wilfried Tsonga came back from 5-2 down in the final set to beat Canadian teenager Denis Shapovalov in an epic
Image:Will Ferrell and his wife Viveca Paulin were back for more tennis in Melbourne
Image:Britain's Laura Robson and doubles partner CoCo Vandeweghe talk tactics
Image:Temperatures were forecast to peak at 29 in Melbourne on Wednesday
Image:Fans flocked to see Rafael Nadal in action
Image:Nadal was in ominous form as he powered past Leonardo Mayer
Image:Russia's Andrey Rublev celebrates his four-set win against veteran Marcos Baghdatis