For Roger Federer and Rafael Nadal, it was a happy anniversary.
For Stan Wawrinka, it was not a happy birthday.
Federer and Nadal — playing back-to-back on stadium court on the 13th anniversary of their very first match — both advanced Tuesday to the quarterfinals of the Miami Open, surviving strong tests in both cases.
Wawrinka wasn't as fortunate, the No. 1 seed getting bounced on his 32nd birthday by teenager Alexander Zverev.
"Every match is going to be tough from now on," said second-seeded Kei Nishikori, who also survived a three-setter to reach the quarters.
That seems to already be holding true.
The fourth-seeded Federer...