With the glamour and style of the U.S. Open at the center of the sports world these days, fans should recognize how crucial both Serena and Venus Williams have been in revitalizing tennis. The Atlantic Wire notes that the Williams sisters’ power game changed women’s tennis completely while also roping in new viewers. Despite all the hype surrounding Roger Federer vs. Rafael Nadal, Serena Williams remains CBS’ highest ratings draw. The siblings also stand as the only two American women’s tennis players currently on the radar; no other Americans are even close to them in the rankings. However, the Williams sisters have consistently been dogged by criticism that they aren’t living up to their potential, and some still hold this view. “They should have been more than tennis stars,” one blogger writes.