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At 36, Roger Federer is the oldest number one

At 36, Roger Federer is the oldest number one

On Friday, Roger Federer became the oldest world number one and reached the semi-finals of the Rotterdam Open. The 20-time Grand Slam title winner overcame the early setback and beat Robin Haase of Netherlands by 4-6, 6-1, 6-1. The 36-year-old Swiss will now replace his old rival 31-year-old Rafael Nadal at the top rankings.