Madison Keys locks in quarterfinal showdown with Elina Svitolina

Madison Keys made her first ever grand slam semifinal at the Australian Open. 

That was in 2015. A decade later, the 29-year-old is vying to get there again. 

She’s just one step away, after making the quarterfinals with a momentum-shifting three-set victory over Elena Rybakina. 

“It’s hard to…