Early on in Friday's US Open, Serena Williams looked like she was headed for trouble, after losing the first set to fellow American wildcard Bethanie Mattek-Sands.

But in characteristic dramatic fashion, Williams pulled off a massive comeback in the last two sets, she managed to hit a killer forehand which ended in her doing the splits.

When your splits game is on fleek and you know it. pic.twitter.com/4l2426AKDM

— WTA Reactions (@WTAreactions) September 5, 2015

Williams now moves on to the Round of 16 where she'll meet another American, 20-year-old Madison Keys.