By the end of 2010, Rossi's relationship with Yamaha had cooled following Jorge Lorenzo's dominant championship-winning season, and Ducati — the Italian manufacturer that had never been able to tempt Rossi into their garage when he was at Honda — moved aggressively to sign him. Rossi confirmed on 15 August 2010 that he would join the Ducati factory team on a two-year deal starting in 2011, partnering with former Honda teammate Nicky Hayden. He tested the Ducati Desmosedici for the first time in Valencia on 9 November 2010, his first appearance on an Italian motorcycle since 1999.
The move carried enormous symbolic weight. Rossi was the greatest rider of his era and Ducati was an Italian marque hungry for consistent championship contention. He had declined Ducati's approaches during his Honda years, partly because of their uncompetitiveness at the time. Now, heading into what many considered the twilight of his peak years, the combination seemed to promise both a fresh challenge and a patriotic storyline that Italian motorsport embraced eagerly.
The first season began with immediate disappointment. Rossi finished seventh at the opening round in Qatar, and a collision with Casey Stoner in Spain — for which Rossi apologised, drawing the famous response from Stoner that "your ambition outweighs your talent" — illustrated the early mismatch between rider expectations and machine capability. His best result of the year came in France, where he took a podium, but only a single podium in the entire season was a shocking underperformance for a rider with seven premier-class titles.
The remainder of the year produced consistent top-ten finishes but no victories. Three consecutive retirements closed the season in Japan, Australia, and the Valencian Community round, with the Malaysian Grand Prix having been cancelled after the fatal accident involving Marco Simoncelli. Rossi finished seventh in the championship with 139 points, 211 points behind champion Casey Stoner. It was the first time in his Grand Prix career that he had finished a season without a win.
The second season offered no significant improvement. Rossi's best results came in wet conditions — second at the French Grand Prix and second again at the San Marino Grand Prix — but the Ducati Desmosedici continued to frustrate him in dry race conditions. The bike's character did not suit his riding style, and the team's engineering approach could not bridge the gap within the two-year contract timeframe.
He finished sixth in the championship with 163 points, 187 points behind champion Jorge Lorenzo. The season confirmed what had become apparent through 2011: the partnership had not worked, and neither party had found the key to making it function. Rossi elected not to renew with Ducati.
The Ducati Desmosedici was fundamentally difficult to ride consistently, placing high demands on corner-entry style and front-end commitment that did not align with the feedback and feel Rossi preferred. The bike had been optimized around Casey Stoner's exceptional ability to manage front-end instability at extreme lean angles — a characteristic so specific to Stoner that other highly accomplished riders, including Nicky Hayden across five seasons at Ducati, could not extract comparable results. Rossi and Ducati's engineers worked extensively to modify the machine, but the underlying architecture proved resistant to change within the contract period.
On 10 August 2012, it was confirmed that Rossi would rejoin the Yamaha factory team for 2013. The reunion brought an immediate partial restoration of form: he scored two race wins in 2013 and 2014 respectively and returned to consistent championship contention.
The Ducati period became a reference point in motorsport discussions about the relationship between machine characteristics and riding style. It demonstrated that even the most talented rider in the sport could be neutralized by an incompatible machine, and it reshaped public understanding of how much Stoner's 2007 championship had depended on a unique match between his riding technique and that specific motorcycle. Rossi's failure at Ducati paradoxically enhanced appreciation of what Stoner had achieved on the same bike.