Most consecutive Men’s Grand Slam semi-finals

According to Official Guinness Records,

The most consecutive Grand Slam tennis tournament men's singles semi-final appearances by an individual player is 23 by Roger Federer (Switzerland) between 2004 and 2010.

For a complete list of 2010 records, please visit 2010 Guinness Records in Switzerland.

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Other Switzerland records that might interest you:

• Largest particle accelerator
• Largest fridge
• Longest trike
• Oldest ice hockey player at a Winter Olympic Games (male)
• Fastest win of the Tour du Lac Leman
• Longest vacuum system
• Largest superconducting magnet
• Smallest map
• Highest energy particles in a particle accelerator
• Most competitive 100 m sprint races completed in sub 10 seconds
• Most Worldloppett Masters titles (gold)
• Most expensive city to eat in restaurants
• First artificial fog building
• Largest silicon detector
• Smallest gun, revolver
• Longest rowing race