As time passes, the old gets replaced with the new. It's inevitable, and while some players, such as Roger Federer and Rafael Nadal, have fought Father Time with great success, others have not fared as well. Andy Murray, Stan Wawrinka, Milos Raonic and Novak Djokovic are all examples of stars slipping from great heights in recent months.
It's made room for younger players to step in and fill their shoes. Denis Shapovalov, after reaching the semifinals of Madrid replaced Raonic as the new Canadian No. 1, even defeating the 27-year-old in the round of 16. The teenager is up to a career-high ranking of No. 26.