Five-time champion Djokovic was drawn in Group Guga Kuerten on the day he returned to the top of the rankings and Rafael Nadal withdrew from the season-ending tournament due to ankle and abdominal injuries.
Nadal said on Twitter on Monday that he was still bothered by the stomach muscle issue that forced him to withdraw from last week's Paris Masters and opted to have ankle surgery now in preparation for 2019.
Of the two grand slams and six Masters 1000 events on hard courts in 2018, Rafael Nadal has only finished one and will miss the ATP Finals.
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The group of seven girls and five parents had "highly visible" green safety vests on at the time, police said in a statement . In Wisconsin, the school, the community of Scouts and most of Chippewa were preparing to attend a memorial at 6 p.m.
"I have done everything possible to get to the end of the season in good condition, both to Paris and to London, doing things well, and I really wanted to play".
What Anderson can not ascribe to, however, is progressing further than fourth in the world, with the points tally of current number one Novak Djokovic, withdrawn, but still current number two Rafael Nadal and number three Roger Federer beyond the South African's reach - come what might.
The problem we discovered a very long time, and she would occasionally stop me from playing.
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John Isner will take Nadal's place in the field ahead of Monday evening's draw, while the Spaniard's absence also ensures Novak Djokovic will finish the season as the year-end world No 1.
"Unfortunately, I had an abdominal problem in Paris last weekend and I also have a problem with an ankle join that needs to be dealt with in the operating room today".
Nadal hasn't competed since he retired from his U.S. Open semifinal because of a painful right knee.
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He was dumped out of the French Open as the 20th seed at the quarterfinal stage before embarking on a fine run.