Novak Djokovic is the top seed in this group and is pitted against Alexander Zverev, Marin Cilic and John Isner, which on paper definitely looks like the tougher group of the two, especially given the surface and conditions.
Rafael Nadal pulled out of the season-ending ATP Finals because of an abdominal injury and had surgery on his right ankle Monday.
Nadal did win the Rogers Cup in Toronto this season, but he has otherwise endured nothing but misery in this year's biggest hard-court events. Unfortunately, I had an abdominal problem in Paris last week and I also have a foreign body in the ankle joint that has to be removed through surgery.
"Reflecting on what I've been through in the previous year, it's quite a phenomenal achievement", said Djokovic, who has knocked Rafael Nadal from the world top spot.
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Indonesian search and rescue workers had since found debris and possibly the fuselage of the nearly new Boeing 737 MAX 8. It has had issues of safety and poor management in the past and was banned from flying into European airspace until 2016.
'I would reckon the Novak Djokovic group is the tougher one, ' said the German, who coached Djokovic for three years.
In a statement released on Twitter, Nadal confirmed the problem which forced him to miss the final Masters 1000 tournament of the campaign and continued pain in his ankle was the reason behind his absence from the elite eight-player field in London.
"With this, I hope to be in full health for the next season".
Nadal hasn't competed since he retired from his U.S. Open semifinal because of a painful right knee. "I couldn't be happier to finish the season like this".
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India kept importing oil from Iran knowing it well that it will be saved from sanctions on being strategic partner of the US. Washington will reapply far-reaching sanctions on Iran's petroleum and banking sectors starting on Monday.
Meanwhile, reaching the final in London would rank alongside Anderson's US Open and Wimbledon final defeats against Nadal and Djokovic respectively as the most auspicious achievements of his career.
"What Novak has achieved this season has to go down as one of the great sporting comebacks", said ATP president Chris Kermode.
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Yemen has been at war since March 2015, when Houthis occupied northern Yemen, forcing the government into exile. He also said airstrikes by the Arab coalition, backed by the US , "must cease in all populated areas in Yemen".