Answer by taking a quote from the following article:

Edouard Louis Joseph, baron Merckx (Dutch pronunciation: ['merks]; born 17 June 1945), better known as Eddy Merckx, is a Belgian former professional road and track bicycle racer who is widely seen as the most successful rider in the history of competitive cycling. His victories include an unequalled eleven Grand Tours (five Tours of France, five Tours of Italy, and a Tour of Spain), all of the five Monuments, three World Championships, the hour record, every major one-day race other than Paris-Tours, and extensive victories on the track. Born in Meensel-Kiezegem, Brabant, Belgium, he grew up in Woluwe-Saint-Pierre where his parents ran a grocery store. He played several sports, but found his true passion in cycling.

Edouard Louis Joseph Merckx was born in Meensel-Kiezegem, Brabant, Belgium on 17 June 1945 to Jules Merckx and Jenny Pittomvils. Merckx was the first-born of the family. In September 1946, the family moved to Woluwe-Saint-Pierre, in Brussels, Belgium in order to take over a grocery store that had been up for lease. In May 1948, Jenny gave birth to twins: a boy, Michel, and a girl, Micheline. As a child Eddy was hyperactive and was always playing outside. Eddy was a competitive child and played several sports, including basketball, boxing, football, and table tennis. He even played lawn tennis for the local junior team. However, Merckx claimed he knew he wanted to be a cyclist at the age of four and that his first memory was a crash on his bike when he was the same age. Merckx began riding a bike at the age of three or four and would ride to school every day, beginning at age eight. Merckx would imitate his cycling idol Stan Ockers with his friends when they rode bikes together. In summer 1961, Merckx bought his first racing license and competed in his first official race a month after he turned sixteen, coming in sixth place. He rode in twelve more races before winning his first, at Petit-Enghien, on 1 October 1961. In the winter following his first victory, he trained with former racer Felicien Vervaecke at the local velodrome. Merckx won his second victory on 11 March 1962 in a kermis race. Merckx competed in 55 races during the 1962 calendar year; as he devoted more time to cycling, his grades at school began to decline. After winning the Belgian amateur road race title, Merckx declined an offer from his school's headmaster to have his exams postponed, and dropped out of school. He finished the season with 23 victories to his name. Merckx was selected for the men's road race at the 1964 Summer Olympics, where he finished in twelfth position. Later in the season, he won the amateur road race at the UCI Road World Championships in Sallanches, France. Merckx remained an amateur until April 1965, and finished his amateur career with eighty wins to his credit. Merckx opened the 1967 campaign with two stage victories at the Giro di Sardegna. He followed these successes by entering Paris-Nice where he won the second stage and took the race lead. Two stages later, a teammate, Tom Simpson, attacked with several other riders on a climb and was nearly 20 minutes ahead of Merckx, who remained in a group behind. Merckx attacked two days later on a climb 70 km into the stage. He was able to establish a firm advantage, but obeyed orders from his manager to wait for the chasing Simpson. Merckx won the stage, while Simpson secured his overall victory. On 18 March, Merckx started the Milan-San Remo and was seen as a 120-1 favorite to win the race. He attacked on the Capo Berta and again on the Poggio, leaving only Gianni Motta with him. The two slowed their pace and were joined by two more riders. Merckx won the four-man sprint to the finish. His next victory came in La Fleche Wallonne after he missed out on an early break, caught up to it, and attacked from it to win the race. On 20 May, he started the Giro d'Italia, his first Grand Tour. He won the twelfth and fourteenth stages en route to finishing ninth in the general classification. He signed with Faema on 2 September for ten years worth 400,000 Belgian francs. He chose to switch over in order to be in complete control over the team he was racing for. In addition, he would not have to pay for various expenses that came with racing such as wheels and tires. The next day, Merckx started the men's road race at the 1967 UCI Road World Championships in Heerlen, Netherlands. The course consisted of ten laps of a circuit. Motta attacked on the first lap and was joined by Merckx and five other riders. The group thinned to five as they reached the finish line where Merckx was able to out-sprint Jan Janssen for first place. In doing so, he became the third rider to win the world road race amateur and professional titles. By winning the race he earned the right to wear the rainbow jersey as world champion. Merckx entered the 1970 campaign nursing a case of mild tendonitis in his knee. His first major victory came in the Paris-Nice where he won the general classification, along with three stages. On 1 April, Merckx won the Gent-Wevelgem, followed by the Tour of Belgium - where he braved a snowy stage and followed the day up with a victory in the final time trial to secure the title - and the Paris-Roubaix. In the Paris-Roubaix, Merckx was battling a cold as the race began in heavy rain. He attacked thirty-one kilometers from the finish and went on to win by five minutes and twenty-one seconds, the largest margin of victory in the history of the race. The next weekend, Merckx attempted to race for teammate Joseph Bruyere in the La Fleche Wallonne; however, Bruyere was unable to keep pace with the leading riders, leaving Merckx to take the victory. After the scandal at the previous year's Giro d'Italia, Merckx was unwilling to returning to the race in 1970. His entry to the race was contingent upon all doping controls be sent to a lab in Rome to be tested, rather than being tested at the finish like the year before. He started the race and won the second leg, but four days later showed signs of weakness with his knee as he was dropped twice while in the mountains. However the next day, Merckx attacked on the final climb into the city of Brentonico to win the stage and take the lead. He won the stage nine individual time trial by almost two minutes over the second-place finisher, expanding his lead significantly. Merckx didn't win another stage, but managed to expand his lead a little more before the race's conclusion. Before beginning the Tour, Merckx won the men's road race at the Belgian National Road Race Championships. Merckx won the Tour's opening prologue to take the race's first race leader's yellow jersey. After losing the lead following the second stage, he won the sixth stage after forming a breakaway with Lucien Van Impe and regained the lead. After expanding his lead in the stage nine individual time trial, Merckx won the race's first true mountain stage, stage 10, and expanded his lead to five minutes in the general classification. Merckx won three of the five stages contested within the next four days, including a summit finish to Mont Ventoux, where upon finishing he was given oxygen. Merckx won two more stages, both individual time trials, and won the Tour by over twelve minutes. He finished the Tour with eight stage victories and won the mountains and combination classifications. The eight stage wins equaled the previous record for stage wins in a single Tour de France. Merckx also became the third to accomplish the feat of winning the Giro and Tour in the same calendar year.

Was there any doping issues?
His entry to the race was contingent upon all doping controls be sent to a lab in Rome to be tested, rather than being tested at the finish