The All England Lawn Tennis Club requires players participating at The Championships, Wimbledon, to wear all white.
This makes it difficult to distinguish one player's clothing from another's.
But discernible style lies in the details. It's in the trim around pockets and strategically placed pops of color.
Federer and Williams showcased formal-like sports jackets atop their playing attire. The defending champions proved, once again, tailored suits trump those off the rack.
Caroline Wozniacki's figure-flattering Stella McCartney dress also stood out.
Of course there are those who try too hard or not hard enough.
Among the worst is Bethanie Mattek-Sands. Her attempt to stand out fell flat.
Here's a look at the rest of the best and worst dressed at The Championships.