In the case of Iran, the lifting of sanctions has paved the way for direct relations.
World number two Roger Federer launches his bid for a sixth US Open title, and his first since 2008, with a first-round match against Argentina's Leonardo Mayer at the Arthur Ashe Stadium on Tuesday.
Martina Navratilova is set to retire just a month short of her 50th birthday.
No official reason was given for Andre Agassi pulling out of the Canadian Open.
Australian Nick Kyrgios exited the Rogers Cup to boos and a hefty fine from the ATP for insulting remarks.
Russian anti-doping officials have for the first time acknowledged a massive doping conspiracy in their country that has rocked world sport, the New York Times reported on Tuesday.
Stan Wawrinka reached his second final of the season as Nick Kyrgios retired injured from their semi-final at the ATP Dubai Championships on Friday. The Australian quit due to back pain while trailing 6-4, 3-0, having had on-court treatment after the seventh game of the opening set. Wawrinka now moves into position for a possible second trophy of the season after winning in Chennai to start the year. The French Open champion will face either sixth seed Feliciano Lopez, who advanced in the quarter-finals when Novak Djokovic was unable to continue due to an eye infections or former Australian Open finalist Marcos Baghdatis. Wawrinka, ranked fourth, carries an enviable record into the Saturday title match at the Aviation Club, having won his last eight finals.
The world has suffered record financial losses of around $200 billion this year as a result of weather-related natural disasters
Bangladesh's national carrier Biman will sue US authorities for barring one of its aircrafts from landing at the JFK Airport in New York this week, officials said on Wednesday.
Citizens of eight of 10 nations polled by leading newspapers oppose the re-election of George W Bush as president.
Eugenie Bouchard's mid-season nosedive continued on Tuesday as the Canadian was swept aside 6-3 6-4 by Croatian qualifier Donna Vekic despite having home advantage and the backing of an excited crowd in a first round clash at the Rogers Cup.
The US Open champion has pulled out of the Rogers Cup event in Montreal.
Aaron Peirsol and Leisel Jones set world records to win their second gold medals at the world championships.
Kei Nishikori swept aside Rafael Nadal in the quarter-finals of the Rogers Cup.
He was being treated for liver cancer.
Nick Kyrgios continued his impressive run of form ahead of this month's Australian Open by powering the host nation to the mixed-team Hopman Cup title against Ukraine in Perth on Saturday.
Jacques Villeneuve had confronted Narain Karthikeyan after the European Grand Prix, accusing India's first F-1 driver of blocking him
A union representing British sportsmen and women has launched legal action in Switzerland to try to ensure more sympathetic treatment for athletes caught using recreational drugs.
Andy Roddick is looking to break the world number one's 12-1 commanding hold over him when they meet in the Australian Open semis.
Former India hockey captain Vasudevan Bhaskaran shares his Olympics experiences with Shobha Warrier.
2016 F1 calendar to feature record 21-race campaign
Britain's world number two Andy Murray pulled out of the US Open on Saturday, citing a hip injury.
The World Anti-Doping Agency (WADA) has approved a $1.47 million increase in its expenditure budget for next year.
Alexandre Bissonnette, a French-Canadian political science and anthropology student, appeared at a Quebec City court on Monday, he also faces five counts of attempted murder.
British tourists returning from Egypt told to leave luggage behind as airport security is tightened in wake of disaster in Sinai
Maria Sharapova's mix of grit and power were enough to see off American teenager Sofia Kenin 7-5, 6-2 in the third round of the US Open on Friday.
The Indian ace made a shocking exit from the Rogers Cup, losing to Italian qualifier Alberta Brianti.
The top seeds were shocked by Tommy Haas of Germany and Jurgen Melzer of Austria in the \nPilot Pen tournament.
Andre Agassi knocked off Nicolas Kiefer 6-4, 6-2 while Rafael Nadal beat Sebastien Grosjean 6-4, 6-4.
Australia's Lleyton Hewitt retired from his first round match against Frenchman Florent Serra at the Montreal Masters.