Cycling's most iconic race will open with a team trial around the Danish capital, known for its pro-cycling policy.
A swathe of elite cyclists have chosen this five-day race, won by Valverde last year, as part of their early-season bid to get back to top form.
Viviani was able to stay with the lead group over four tough climbs and emerge from the slipstream of Deceuninck-Quick Step teammate Michael Morkov in the final metres to pip Ewan at the post.
The UCI MTB Class-3 event is organized by Qatar Cyclists in association with Qatar National Tourism Council (QNTC) and is supported by Qatar Cycling Federation.
New Zealander Bevin’s ochre leader's jersey hopes were in the balance after he was taken to hospital with a suspected rib and collarbone injury from a crash nine kilometres (5.5 miles) from the finish at Strathalbyn.
Deceuninck–Quick-Step's Viviani, the omnium gold medallist at the 2016 Rio Olympics and one of the world's leading sprinters, powered out of the pack to reel in Germany's Max Walscheid and claim the ochre jersey after the first of six stages.
The 33-year-old Kenyan-born cyclist will aim to dethrone his Team Sky team-mate Geraint Thomas, who will also target the sport's showpiece event.
The Camp is sponsored by Angry Birds World, Baladna, Cage Sport, Friends of the Environment centre and 7th Heaven Arts centre.
Ebrahim Alromaihi won the title last year with a time of 1:12:43sec followed by Mubarak Alajji with 1:16:45sec and Abdulla Shaheen Alkaabi with 1:20:00sec respectively.
The 28-year-old, runner-up to Chris Froome in the Tour de France in 2013 and 2015, is a true contender for a win in the sport's greatest Tour.
Team Sky have clocked up eight Grand Tour wins since their formation, but they have also been plunged into controversy for using special exemptions to administer drugs that can enhance performance.
Al Hammadi and Daniel focused on primary school students as they visited eight schools that included visits to Ahmad Mansour School in Westbay and Lycée Voltaire in Al Waab, one day before launching their challenge.
The duo will cover a distance of more than 500kms to visit a number of schools to create road safety and active lifestyle awareness.
The pair will cover a distance of more than 500kms within the course of four days, visiting schools to raise awareness of road safety and the health benefits of physical activity.
The first and last part of the course featured elements of motocross route, appreciated by 150 riders who started the race.