Swiss tennis maestro Roger Federer has slipped down four positions in the latest ATP rankings released by the association on Monday to 15th. Notably, the former world number one had exited the top 10 last week.

ATP Rankings: Roger Federer slips four positions to 15th, Jannik Sinner moves to career-high 11th spot

Italian 19-year-old Jannik Sinner became the Barcelona Open's youngest semi-finalist since 2005 after overcoming Russian Andrey Rublev 6-2, 7-6 (8/6) on Friday. Sinner, ranked 19th in the world, will next face Stefanos Tsitsipas after the Greek second seed defeated Felix Auger-Aliassime 6-3, 6-3.

Sinner to play Tsitsipas in Barcelona semi-finals

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