Five time champion Roger Federer faces the biggest test of US Open credentials to date when he takes on Gael Monfils for a place in the semi-finals.
The pair are just getting underway in the last men's quarterfinal, and while Monfils has only ever beaten Federer indoors, the Frenchman's strong serve and back court power have seen him shine in the first four rounds.
The winner will face Croatian Marin Cilic, who won through to his first US Open semi with a straight-sets win over Thomas Berdych.
Cilic is looking forward to watching Federer and Monfils, and take the chance to relax ahead of his semifinal.
Monfils has never reached the semifinals of a hard-court grand slam.
Take your Radio, Podcasts and Music with you
Get the iHeart App
Get more of the radio, music and podcasts you love with the FREE iHeartRadio app. Scan the QR code to download now.
Download from the app stores
Stream unlimited music, thousands of radio stations and podcasts all in one app. iHeartRadio is easy to use and all FREE
