Yego’s throw of 87.88m would have won him the gold medal had it not landed off-field.

He last won Gold in 2015.

Current window for Kipchoge to run has been narrowed to 12th-14th October with target date of the 12th Event date will be confirmed three days out and start time the day before the INEOS 1:59 Challenge.

The question on everyone’s mind is not just if Eliud Kipchoge is going to make history and run the first ever sub-two-hour marathon, but when?

On Sunday 6th October the decision was made for Kipchoge to fly from his training camp in Kaptagat, Kenya to Vienna overnight on 7th October, with his coach Patrick Sang and a number of his team-mates, now pacemakers.

His manager Valentijn Trouw informed Kipchoge yesterday, who confirmed he was ready to fly.

The team behind Kipchoge are leaving nothing to chance in the final week before the first scheduled date for the Challenge, Saturday 12th October.

It’s now down to the INEOS 1:59 meteorology and performance experts to provide weather data to Kipchoge’s coaching team and collectively make the decision as to what date and time the INEOS 1:59 Challenge will take place, to give Kipchoge the best possible chance of success.

One of the reasons Vienna was picked for the venue of the INEOS 1:59 Challenge was its favourable weather conditions in October.

The first window for Kipchoge to run has now been narrowed to 12th-14th October, with a target date of the 12th.

The conditions are, for now, looking to be within an acceptable range for the first weekend of the window.

The call made to fly Kipchoge from Kenya to Vienna was the first stage of a pre-agreed decision process by the INEOS 1:59 Performance team to select the best date for the INEOS 1:59 Challenge.

“The unique nature of this extraordinary event means we are not in a position where we can confirm the date or the start time of the Challenge until we can be absolutely certain the weather conditions are suitable”

The next pivotal date is Wednesday 9th October, three days out from the targeted Challenge date.

The Performance team will then decide if the date for the INEOS 1:59 Challenge will either be confirmed as the 12th October or delayed.

If the green light is given the three-day countdown begins and Kipchoge will switch his nutrition and begin carb-loading. Kipchoge and his team can then make their final preparations and the world can start getting ready to watch the INEOS 1:59 Challenge live.

Once the date is set, the exact start time for the INEOS 1:59 Challenge will be confirmed the day before.

The start time will be between 5AM – 9AM local time (CEST). The decision for the optimal start time will take into account various factors including weather, nutrition and Kipchoge’s circadian rhythm.

Robby Ketchell, who is leading the weather analysis for the INEOS 1:59 Challenge Performance Team, said: “We know there are millions of people around the world who want to watch Eliud make history, whether that is on TV or on the streets in Vienna, and they want to know when it will be taking place.

“The unique nature of this extraordinary event means we are not in a position where we can confirm the date or the start time of the Challenge until we can be absolutely certain the weather conditions are suitable.

“We have got a world-class team of meteorological experts working on this alongside the Austrian Meteorological Office to inform the Performance team and enable the decision process, and in turn let fans around the world set their alarm clocks and be part of the INEOS 1:59 Challenge.”

The optimum weather conditions for the INEOS 1:59 Challenge are a temperature between 7 and 14 degrees Celsius, humidity below 80 per cent, dry conditions and without too much wind.

The INEOS 1:59 Challenge will be streamed live by YouTube on the INEOS 1:59 Challenge page.

Viewers will also have the option to watch the race coverage on a ground-breaking second screen option on www.ineos159challenge.com.

To see a list of other broadcasters showing the INEOS 1:59 Challenge or to find out how you can watch the event from the roadside if you are in Vienna, click here.

In a race that started at midnight local time, Briton Charlotte Purdue was among the athletes to pull out in temperatures of 32C and with humidity reaching over 70 percent.

Chepngetich, 23, took the first gold of the championships in two hours 32 minutes 43 seconds with athletes attempting to complete six 7km loops of the Corniche in the Qatar capital.

Bahrain’s defending champion Ruth Chelimo, 39, was second in 2:33.46 and Commonwealth champion Helalia Johannes of Namibia, also 39, took bronze in 2:34.15.

Organisers decided to go ahead with the event in its scheduled slot despite fears that the conditions might not be conducive for marathon running.

Ethiopia’s marathon coach Haji Adillo Roba witnessed his trio of athletes stop, including Tokyo Marathon winner Ruti Aga.

“We never would have run a marathon in these conditions in our own country,” he told BBC Sport during the race. “I’ll be interested to see how many finish.”

Purdue, the third fastest British female marathon runner in history, withdrew after the start of the third loop. Compatriot Tish Jones pulled out before the race with a leg injury.

Chepngetich was among a small group that included Chelimo, two-time champion Edna Kiplagat, Kenya’s Visiline Chepkesho and Johannes that broke clear from the rest as early as the fifth kilometre.

Israel’s European champion Lonah Chemtai Salpeter was among the pack but dropped out as the quartet stretched away from her.

It became a two-horse race between Chepngetich and Chelimo before the eventual winner surged again, this time decisively, to secure her first major championships medal.

“I was not expecting to be a medallist in such tough conditions,” Chelimo told AFP.

He won the fifth edition of the Copenhagen Half Marathon in 57 minutes and 59 seconds smashing the previous time of 58.18 set by Abraham Kiptum in Valencia last year.

The 26-year-old Kenyan was returning to the Danish capital where he won his first three world half-marathon titles.

Kenya’s Bernard Kipkorir finished second with a time of 59:16 while Ethiopia’s Berehanu Wendemu Tsegu was third a further six seconds behind.