The WTA keeps statistics in 10 different, significant categories, including aces, break points saved, second-serve return points won and such. (You can view them all here.) Serena Williams, Karolina Pliskova, Camila Giorgi, and Klara Koukalova are among the bewilderingly diverse group that leads one or more of these categories.
World No. 5 Simona Halep leads none of the 10 departments. Halep’s Romanian countrywoman Monica Niculescu, who’s currently ranked No. 78, tops one statistic—break points converted—and is third in two others. Yet Halep ranks no higher than fourth in any category—she's No. 4 in second-serve return points won—and finds herself listed in just two others (No. 9 in return games won, and No. 10 in service games won). Halep’s weapon of choice is the the serve, yet she isn’t in the top 10 of any serve-specific category (aces, first-serve points won, etc.).
There’s another category in which Halep is buried deep among the journeymen, and that’s the rating we might call Celebrity Index. Halep is a seven-time champion on the WTA, but she may be best known for having had breast reduction surgery in 2009 and the sundry controversies created by the reactions to that decision.
All sensitivities, prudish trepidations, and sophomoric jokes aside, the procedure appears to have been a contributing if not a determining factor in her success. On her first year on tour, 2009, Halep won her first ITF title; a year later, she successfully qualified for Roland Garros, all before turning 19. But she complained that her breasts left her “uncomfortable” during matches and compromised her playing ability.
Halep wasted no time moving on after her surgical procedure, but she didn’t turn into a Top 10 player overnight. Her progress can be plotted on a graceful, upward curve, not a spike. She reached the Top 100 in 2010, and she found herself on the cusp of the Top 50 in 2011. But her big year was 2013, when she ran the table at tournaments in Nürnberg, 's-Hertogenbosch, Budapest, New Haven, Moscow, and Sofia. She finished the year ranked No. 11 in the world.