The U.S. Open begins its second week with intriguing matchups as some of the world's best players try to play their way into the quarterfinals.

No. 1 Roger Federer and No. 4 Serena Williams will feature on Arthur Ashe Court from the Billie Jean King National Tennis Center in Flushing Meadow, N.Y., as both look to advance to yet another quarterfinal at the U.S. Open. Neither has dropped a set so far. Federer's fourth-round opponent, American No. 25 Mardy Fish, might prove a bigger challenge to the world's top player.

A key matchup at Louis Armstrong Stadium during the day session between No. 11 Nicolas Almagro and No. 6 Tomas Berdych will be the day's closest meeting between two ranked players as the two battle for a quarterfinal spot.

Men's No. 3 Andy Murray will highlight the night session at Arthur Ashe, as he takes on No. 15 Milos Raonic.

For a full schedule for Monday, visit USOpen.org. For live streaming coverage, check out U.S. Open Live.

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