Warrior Wawrinka rekindles old fire

Veteran shows he's still a force by stunning Tsitsipas

PARIS - This is why Stan Wawrinka went through two operations on his left knee in the span of a month. Why he dealt with the rigors of rehabilitating that joint.

Why he did all the work, on and off the court, required to get back to the grind, to raise his ranking from outside the top 250, to once again matter in the sport he loves.