The former world No. 7 is having difficulty staying healthy in 2016.
"I'm happy that we have a new face in the world number one," says world No. 3.
World No. 90 wins second career title.
Celebrating the arrival of autumn, SI reveals Wozniacki outtakes.
Kyrgios reveals the key to his imposing serve.
The 34-year-old is targeting a return at the WTA Finals in Singapore.
Novak Djokovic and friends got together in Milan and--naturally--lots of laughs were had.
