US Open 2019: Roger Federer, Stan Wawrinka, Serena Williams point to the last eight

NEW YORK: Roger Federer potential path of the United States Open final no longer includes nemesis Novak Djokovic , or any other person who has hit him on a hard court, for that matter.

Federer is 26-0 on that surface against the remaining players in his half of the group. The next step for the five-time champion in Flushing Meadows is a quarter-final against Grigor Dimitrov, not sown.

The other men's quarterfinals on day 9 of the Grand Slam tournament is No. 5 Daniil Medvedev against n. ° 23 Stan Wawrinka , which advanced when defending champion and No. 1 seed Djokovic retired from his fourth round match due to a painful left shoulder.

Federer is 6-0 against Dimitrov on hard courts and, if he advances, would bring undefeated records on the surface to a semifinal against Wawrinka (17-0) or Medvedev (3-0).

The 38-year-old Federer is trying to become the oldest Grand Slam semifinalist since Jimmy Connors was 39 during his 1991 run at the United States Open ; No. 78 Dimitrov is trying to become the low est-ranked semifinalist in New York since Connors was No. 174 that year.

Wawrinka, who won the 2016 United States Open , faces maybe the most in-form player on tour at the moment in Medvedev, who leads the ATP with 48 wins and is 9-0 in quarterfinals this year.

Serena Williams tries to return to the semifinals when he plays against quarterfinals Wang Qiang, while No. 5 Elina Svitolina meets No.