2011 Omega Pharma–Lotto season

In March, Gilbert won Montepaschi Strade Bianche by performing a very late-race attack, a tactic that has earned him most of his professional victories. While Gilbert's attacks, when successful, usually get him away alone, this time he had to deal with Alessandro Ballan and Damiano Cunego, who were able to follow. The three decided the race a few bike lengths ahead of the rest of the 20-strong leading group, with Gilbert coming across the line ahead of Ballan and then Cunego.[24] At the first monument race of the season, Milan – San Remo, Gilbert was considered a strong favorite victory, largely due to his win on the Strade Bianche.[25] Greipel also rode, as the team's "Plan B" for victory, but after his injurious crash in the Tirreno–Adriatico, he was not thought to be on the best form.[26] Omega Pharma-Lotto was one of two teams, along with BMC Racing Team, left with more than three riders present in the leading group on the road after a crash on the Le Manie climb 90 km (56 mi) from the finish split the field into two large groups. Roelandts and Greipel both took pulls on the front of the leading group, indicating that Greipel was not on sufficient form to ride for the win himself. Little by little, the leading group that had once been 44 dwindled to only eight, a select group that formed on the Poggio just a few kilometers from the finish. Gilbert tried twice to attack and solo his way to victory, once on the Poggio and once again on the finishing straight in San Remo, but he was chased down by Filippo Pozzato. While he had a gap for a brief moment in the final few meters in San Remo, both Fabian Cancellara and race winner Matthew Goss were able to pass him, leaving Gilbert third.[27] After the race, Gilbert criticized Pozzato for chasing him down, and said that with Goss in the leading group it would have been nearly impossible for him to win.[28]

Philippe Gilbert won all three Ardennes classics in 2011, only the second time that one rider has ever won all three in the same year.

In April, Gilbert had one of the most dominant two-week periods any rider ever has. First, he took the win at Brabantse Pijl, a race seen as a precursor to the Ardennes classics. He and compatriot Björn Leukemans attacked out of what had been a leading group of ten, and stayed clear to the finish where Gilbert won the sprint.[29] Next was the Amstel Gold Race, the first of the Ardennes classics. Gilbert came in as the defending champion, and a strong favorite.[30] He rode a tactically sound race, staying at the front through the many selections over the 31 recognized climbs in the race. After Andy Schleck launched an attack for victory on the Keutenberg, 12 km (7.5 mi) from the finish, Gilbert and Team Katusha's Joaquim Rodríguez were among the group that overtook him on the Cauberg, the final climb. Gilbert's final finishing kick got him clear of Rodríguez by two seconds, earning him the race win for the second year in a row. Team Sky's Simon Gerrans was third.[31] One post-race analysis opined that Gilbert's race demonstrated that he is the best rider in the world on a short uphill finish. Gilbert was the first rider since Rolf Järmann in 1998 to be a repeat winner of the Amstel, and the first since Jan Raas in 1980 to win consecutive editions.[32] The second Ardennes classic was La Flèche Wallonne. Gilbert was mentioned among the contenders, but the Mur de Huy climb at the finish being steeper than anything covered by the Amstel, pre-race analysis viewed Rodríguez, Alberto Contador, and Robert Gesink, among others, as bigger favorites.[33] Saxo Bank–SunGard and Leopard Trek did the bulk of the work in the peloton chasing down the morning escape, which took an advantage that ballooned to 17 minutes at one point. Gilbert later explained that Omega Pharma-Lotto did not contribute much work because their domestiques were spent from work done at Brabantse Pijl and Amstel Gold, and that La Flèche Wallonne, while still a goal for Gilbert, was not as important to him as Liège–Bastogne–Liège.[34] The early escape was indeed caught, and a flurry of attacks and counter-attacks followed. For a while, a group of ten riders held a sustained advantage of less than a minute over the main field. Omega Pharma-Lotto was forced to work at this point, since they had no rider in that leading group. The last breakaway group was of two riders, and while they had a 14-second gap over the rest of the field going into the final kilometer, the third and final ascent of the Mur de Huy made sure that the pre-race favorites figured into the finale. Michael Albasini and Christophe Le Mével tried to solo up the Mur to victory, but they effectively led out Rodríguez and Gilbert. Gilbert again surged past Rodríguez for victory, with Samuel Sánchez rounding out the podium this time.[35]

Liège–Bastogne–Liège was always Gilbert's biggest goal of the spring season, and victories in the first two Ardennes classics, as well as the Brabantse Pijl to precede them, left Gilbert even more anxious for victory. Liège–Bastogne–Liège, nicknamed La Doyenne (French for "the oldest," as it is the oldest continuously run cycling event in the world), is also the fourth monument race of the season.[36] Gilbert was the clear favorite for the race – one analyst referred to it as the "Omega Pharma-Lotto rider versus the peloton."[37] On race day, a group of 13 riders distinguished themselves as the leaders on the road for much of the day. Omega Pharma-Lotto was forced to do most of the work in the main field. Between the Col du Maquisard and the Côte de la Redoute, where the race has often been decided in the past, they stopped pulling at the front of the peloton. The time gap to the leaders briefly increased, before Leopard Trek and Gilbert's former team FDJ sent men to the front. On the next climb, the Côte de Roche aux Faucons, the widely expected attack from Leopard Trek's two leaders, the Schleck brothers, took place. Gilbert marked them, and effectively stayed in their slipstreams as the trio surged to the front of the race, past the remnants of the morning breakaway. Later, Gilbert himself took pulls. Andy Schleck took more pulls than his brother Fränk as the race wore on. At one point, on the Côte de Saint-Nicolas, Gilbert slipped away with only the elder Schleck able to follow. Andy later bridged back. At the finish, which took place on a slight downhill, neither Luxembourger put in any sort of challenge to Gilbert, and his superior sprint got him to the line first ahead of Fränk Schleck in second by a few bike lengths. The win made Gilbert just the second rider in history to win all three Ardennes classics in the same year, after Davide Rebellin in 2004.[38] Factoring in the Brabantse Pijl made him the first rider ever to win all four of those races, which took place over a span of only 11 days, in the same year.[39]

Gilbert's great successes in the Ardennes bore out in the UCI rankings. While the Brabantse Pijl did not contribute points toward the rankings, the other three races did. Gilbert had been 16th prior to the Amstel Gold Race, but took over fifth with his win there. His points also helped his home nation of Belgium take the lead in that classification, and the Omega Pharma-Lotto team moved up four slots as well.[40] Rankings were not published after La Flèche Wallonne, but after Liège–Bastogne–Liège, Gilbert had moved up to world number one, by 120 points over Fabian Cancellara, with Belgium further increasing their lead in the nations classification. Omega Pharma-Lotto moved up another five places, to third.[41]

The team also sent squads to the Trofeo Inca, Trofeo Deià, the Clásica de Almería, Le Samyn, Nokere Koerse, the Handzame Classic, Dwars door Vlaanderen, the Scheldeprijs, Paris–Roubaix, the Eschborn-Frankfurt City Loop, ProRace Berlin, Ruddervoorde Koerse and Halle–Ingooigem, but placed no higher than 13th in any of these races.

The team also sent squads to the Grand Prix José Dubois, the GP Ouest-France, Paris–Brussels, the Grand Prix d'Isbergues, Binche–Tournai–Binche, Paris–Tours, the Nationale Sluitingsprijs, and the Giro del Piemonte, but finished no higher than 13th in any of these races.