What disease did Roger Federer have?

<h2>When Mononucleosis Stalled a Champion</h2> <p>In early 2008, the tennis world was taken by surprise when <strong>Roger Federer</strong> struggled to find his usual dominance at the Australian Open. Months later, the underlying reason came to light: the Swiss maestro had been quietly battling <strong>mononucleosis</strong>.</p> <p>While many fans initially pointed to a bout of food poisoning that severely disrupted his pre-tournament training camp, the fatigue lingered long after. That year's Melbourne major ultimately went to Novak Djokovic, marking a rare stumbling block for Federer during the peak of his career. Yet, true to form, the setback proved only temporary, and he bounced back to reclaim his place at the summit of men's tennis.</p>