Serena Williams vs Karolína Pliskova in battle of the tour's best servers! | US Open 2016 Semifinal

No. 1 seed Serena Williams takes on No. 10 seed Karolina Pliskova in the semifinals of US Open 2016. Serena is on the trail of her seventh US Open singles crown and 23rd Grand Slam singles title, while Pliskova makes her maiden Grand Slam semifinal appearance having never previously progressed beyond the round of 32. Don't miss a moment of the US Open! Subscribe now! https://bit.ly/2Pdr81i